Do the Smoky Mountains get their name from the pollution produced by all the trees?

Introduction:

Long ago, in a debate about the relative merits and faults of Ronald Reagan (which also happened to be a hijack of this thread), I made the mistake of trotting out the old saw that Reagan had once claimed “trees pollute more than heavy industry,” as evidence of his creeping dotage. Sam Stone responded:

After providing an rather irrelevant link to support this claim, he continued:*

Clearly, here, Sam is arguing that the Smoky Mountains derive their name from the pollution produced by all the trees. I found this claim ludicrous, and said as much. When I explained why, however, Sam failed to respond to my counter-argument, and the issue was dropped.

I have avoided bringing up this embarrassment since then, out of a sense of decorum, but in this thread, I found myself so provoked by one of Conan the Canadian’s posts that I couldn’t resist reminding readers that the opinions so expressed were those of a person who also believes that the Smokies got their name from the pollution produced by the trees. To my amazement, not only did Sam continue to defend his claim, but others jumped in to support him.

Despite the fact that there are much more important events occurring in the world, and significantly more important topics for debate, I find that I simply cannot let this question go. It irks me. It is important in part because Sam’s claims are terribly misleading, but also because it provides a textbook example of how scientific findings can be misconstrued to support a given political agenda – or, as seen in this specific case, can be misused to revise the historical record, by reconstructing a historical figure – Ronald Reagan – and transforming him, as it were, from the boob he truly was into a kind of “Renaissance Man of Science.”

But let us start at the beginning. These are the specific statements made by Reagan on this question:

As I pointed out in the previous discussion on this issue, linked above, “80% of the world’s pollution coming from plants and trees would mean, if my math is correct, that 20% of the world’s pollution resulted from industry (and cars);” that is to say, Reagan is claiming above that trees pollute more than heavy industry, precisely as I had originally posited, and not that “some trees pollute,” as Sam would have the reader believe.

Nevertheless it turns out, ironically, that there was a grain of truth to Reagan’s claims. The culprit of the story is isoprene, a hydrocarbon that is also primary ingredient in the set of chemical reactions that lead to the creation of smog. Many species of trees release isoprene – one of a group of substances known as terapenes – sometimes in large quantities. In combination with man-made nitrogen oxide (from car exhaust), isoprene can form alkyl nitrate; and alkyl nitrate, when exposed to sunlight, turns into “photochemical smog.” Hence, in a roundabout sort of way, one can claim that some trees (particularly in urban forests), in combination with man-made sources of NO, contribute to the creation of urban smog. (It was later discovered that in some instances, terapenes reacted with sunlight to create so-called “fine particles” even without the intervention of man-made NOs). On the other hand, I submit that Reagan’s claims, quoted above, are hopeless simplifications of these findings, and seriously misleading as well. Reagan used this simplification, for example, to argue against anti-pollution regulations.

This is the crux of the matter. I beg the reader to keep in mind that isoprene, taken on its own, is not a pollutant. 80% of the isoprene produced by trees is oxidized into CO[sub]2[/sub]; the remaining 20% is converted into so-called “fine particles” (particles with a diameter of less than 2.5 micro-meters) of organic carbon. These particles provide the nuclei for rain, and contribute to the earth’s albedo (i.e., reflectivity). Depending on one’s definition, I suppose these products might also arguably fill the technical qualifications for “pollution,” or “smog,” but that’s stretching it a bit. This also depends on whether or not one defines smog in terms of the presence of fine particles, or in terms of the creation and presence of ozone, NO[sub]2[/sub], and PAN (peroxyacetylnitrate), which are the chemical compounds that make up smog as it is traditionally understood. (Regardless of that, Sam’s claim that “The same condition can be found in the ‘Blue Ridge Mountains’. The ‘Blue’ comes from the constant presence of ground-level ozone and hydrocarbons, emitted from the trees,” is class A disinformation – trees do not release ozone.) Finally, we must also consider quantity: do trace amounts of fine particles, ozone, NO[sub]2[/sub], and PAN in an atmospheric sampling really imply the presence of “smog,” or “pollution,” as the terms are commonly used?

I submit that the isoprene emitted by trees in the Smoky Mountain biosphere does not lead to the formation of a significant “blue haze,” or to the creation of “smog pollution” up on the heights, despite “popular scientific” reports to the contrary. Nor are the Smokies covered in a “constant haze of these type of pollutants,” i.e., isoprene, as Sam clearly believes (isoprene, I repeat, is not a “pollutant.”) Rather, I argue, the “Smoky Mountains” got their name from the wisps of fog that often cloth their upper reaches in Spring, Fall, and Winter. And this fog, I claim, consists almost exclusively of water vapor.

In the last round of this discussion, Sam provides the following information to back up his claims:

…and then crows:

…revealing, alas, once again, the fact that he simply doesn’t know what he’s talking about – or that, at the very least, he is anxious to frame the facts in way that gratuitously supports his agenda.

The report Sam cites is part of an ongoing project at the TVA, in conjunction with the EPA, to study the production and concentration of so-called “fine particles” in the atmosphere. As noted above, these are particles with a diameter of less that 2.5 micrometers, and are primarily comprised of sulfates and organic carbon. Unfortunately, Sam fails to understand (or chooses to ignore) that the project attempted to measure carbon particles exclusively, which in turn comprise only a portion of the total pool of fine particles found in the air. He therefore conveniently skips over the paragraph directly following his quote, which clearly states:

Thus, his claim that “50 to 90 percent of the ‘smog’ in the Smoky mountains comes from natural vegetation emissions,” is a complete misconstrual – and a very long way from the 80% originally claimed by Reagan.

In addition, we run into a definition problem here. The study makes no claims whatsoever about the abundance of NO, NO[sub]2[/sub], ozone, or PAN – the chemical components of what is traditionally understood as “smog” – at all. In fact, without the presence of man-made NO, isoprene cannot be converted into photosynthetic smog or produce ozone. So I am at a loss. Does Sam shift his definition of “smog” when convenient? Is it on occasion PAN/ozone, and on other occasions fine particle mass? Does a fine particle mass of 3 to 8 micrograms (a microgram is 1 millionth of a gram) of carbon per cubic meter of air constitute a “smog?”

In fact, at least according to the EPA, isoprene itself is not implicated in production of “haze,” which is the result of quantities of fine particles in the atmosphere (and is not the same thing as “smog,” by the way). The EPA has currently set a standard of 15 micrograms of PM2.5 per cubic meter air, a level which is proving difficult to meet for many areas of the Southeast, admittedly due to the combination of man-made and natural sources for these particles. Nevertheless, judging from the TVA report above, if we were to remove all human-generated sulfur and fossil-fuel sources of fine particles from the atmosphere, then the concentration of PM2.5 would fluctuate at a natural rate of between 2 and 6 micrograms per m[sup]3[/sup]. And of that quantity, an unknown amount is the result of “combustion of wood and agricultural wastes” – that is to say, is also man-made. In fact, the report speculates that the spike in “modern carbon” recorded during October 2001 was caused by “the burning of wood for heating, the burning of agricultural wastes, and forest fires.” Regarding the findings of this particular study, a related page summarizing the work done on the issue so far notes:

The TVA air samples were gathered at Look Rock. If one were to visit Look Rock during the spring or summer (as I did many, many times in the days of my youth), you would be hard pressed to note any sort of “haze” or “blueness” among the branches. In fact, Look Rock is in the foothills, and seldom becomes particularly foggy at any time of the year – and especially not during the summer, despite the inordinately high levels of PM2.5.
Sam:

Sorry, but I fail to see how the willful misrepresentation of scientific findings falls into the category of “fighting ignorance.”

Although I’m eager to see Sam Stone’s response to this, I just want to pop in and say that this is one of the best OPs I’ve read on the SDMB. Informative, well-researched, and well-written. Thanks!

Daniel

I grew up not too far from the GSM. My grandfather and dad always said the mountains got the name from the frequent mists and foggy conditions that cause the valleys to look like they are full of smoke.

I believe my grandfather.

YMMV. :slight_smile:

Jammer

PS. It wasn’t smoggy in those mountains 35 years ago when I was a kid there. Those trees must be a lot more active now. We need to cut the bastards down before this pollution gets out of hand, I tell you!!!

Oh yes, great OP. You managed to smear my claim that the Smoky Mountains got their name from the blue haze from terpenes with the claims Reagan made. Then you made up a new name for me, Conan the Canadian. That’s very important to the debate. I thought personal insults were frowned upon around here? Or are cute little insulting nicknames de rigeur for the Straight Dope Board now?

As for Trees and pollution, let’s start with The Daily University Science News:

And here’s what the Berkeley Campus News says:

From the OGI School of Science and Engineering

Dr. Rasmussen, by the way, was the person Reagan was quoting in his ‘trees cause pollution’ comments.

On to the Smoky Mountains…

The NOAA says this:

From the University of Regina:

From:

From this summary of the Geology 299 course at the South Dakota School of Mines and Technology:

In the words of Dr. John McKetta, Professor at Texas A&M, Chairman of the National Air Quality Management Commission and Chairman of the National Carbon Dioxide Greenhouse Commission:

From This cite:

From this cite:

And let’s note that the Smoky Mountains got their name from Cherokee Indians in the 1700’s, long before there were any significant man-made contributions to pollution.

So, to answer the OP’s question: Do the Smoky Mountains get their name from the pollution produced by all the trees?

YES

And I didn’t even have to insult you to make my point. What a concept.

Sam, sorry to be blunt, but there’s no way a scientifically literate or even a moderately intelligent interpretation of the cites in your post and in the OP could support the impression that the answer to the titular question is “Yes”. The assertion, quite simply, is risible.

Okay, where DID the Smoky Mountains get their name? The Cherokee Indians called it “A place of blue smoke”. I don’t recall the Cherokee Indians driving cars.

Now, is ALL of the haze TODAY in the Smoky mountains due to terpene production? NO. Not even a majority of it, from what I can tell. That has nothing to do with HOW THEY GOT THEIR NAME.

So the University of Regina isn’t scientifically literate? Or the NOAA? Or the South Dakota School of Mines and Technology? Or Dr. McKenna?

Sam, those citations don’t say what you say they say. You’re ignoring the context in which real air pollution occurs (emissions from industry combining with existing atmospheric chemistry) to exploit the widely acknowledged incidental contribution from the forest ecosystem.

The Smokies are called that because of the blue haze that hovers over the mountains, caused by the amazing amount of water vapor released into the air by vegetation —more than one million gallons per square mile of spruce-fir forest per day. The area receives around 70 inches of rain per average year, courtesy of warm, moist air from the Gulf of Mexico shedding its moisture as it rises over the mountains. On spring and summer days, the same solar energy which reacts with those terpenes you and Ronnie are so worried about also prompts the vegetation to release moisture; that’s where the million gallons per sq. mile comes from, and that goes straight up until it hits the heavy, moist air that’s already there, and voila… smoky mountains.

It’s a light, clear bluish haze that looks quite a bit like wispy smoke. Indeed, it kept the Cherokee from being able to use smoke signals for long distance communication on most days.

I’m baffled. You say they don’t say what I say they say. Or something. Yet, the quotes are very specific. I don’t know why I have to repeat them, but…

University of Regina: **the Blue Smoky Mountains of Virginia have smoke (smog) caused by hydrocarbons, mainly terpenes, emitted by the fir trees. **

Dr. J.J. McKetta: **The Smoky Mountains received their names because of the cloud that was exuded from the trees in that area. **

South Dakota School of Mines and Engineering: trees produce terpenes which cause the haze of the Smoky Mountains

The NOAA: Ultraviolet radiation also reacts with terpenes and other hydrocarbons formed naturally by plants and trees. These reactions can contribute to the formation of smog.

Here’s another cite:

North Carolina Division of Air Quality:

Now, I don’t see a lot of opportunity for misinterpretation here. Is the message coded? Is there a ‘just kidding’ hidden in there if you arrange the letters just right?

I think the problem may be that, while trees do produce some particulates that change the appearance of the air, and while this change may be responsible for the Smoky Mountains’ name, it’s disingenuous to call those particulates pollution. Furthermore, generally this argument is brought up as a canard, suggesting that the particulates formed by trees are responsible for the haze we see here in Asheville and other Appalachian communities.

I think that Sam might be right on the purely technical matter: if you consider the tree particulates and water vapor to be “pollution,” then sure. But the larger issue, of whether trees are responsible in any meaningful sense for pollution, is far different.

Daniel

Sam, I’m kinda baffled here. You’re clearly (from the context of your posting history) not an idiot. However, you’re also not known to deliberately misrepresent factual data. Yet, here we are where you’ve yet to produce a cite for pollution coming from trees in the Great Smoky Mountains, nor a cite which credits naturally released hydrocarbons with any appreciable production of smog through photochemical reactions… and you’re claiming the cites support the assertion that “the Smoky Mountains get their name from the pollution produced by all the trees.”

Odd.

So that’s the nitpick? The word ‘pollution’?

The clear fact is, the Smoky Mountains got their name because terpene emissions caused a bluish haze. Terpene emissions can be categorized as ‘pollution’.

That was the question in the OP to which I answered. Every cite I posted agrees with that, and they are all from academic or scientific organizations.

This has nothing to do with the other question, which is how much do terpene emissions contribute to pollution in the Smoky Mountains TODAY. And Mr. Svinlesha has a good point about that, which I overlooked - instead of being 50-90% of the total, it may in fact be more like 10-25%.

But that’s not the question the OP asked. He asked about the ORIGIN of the name. I posted many cites giving the answer to that question.

Unless you know a real old Cherokee you don’t know if the blue tint caused the name or just the haze, and the haze is mostly water.

To call naturally occurring turpenes a “pollutant” is more than a stretch. Do they, in the form released by trees, cause a health or environmental risk? No? They are part of the needed environmental carbon cycle? Oh. Trees bind more carbon than they release and are the great carbon sink. No health risk? Nope. Plant derived turpenes are used to flavor toothpastes and mouthwashes. Not a nitpick, the crux of the statement.

Just because something makes a nice flavor for mouthwash doesn’t mean I want to breathe it.

DSeid has it exactly right. But you knew that, Sam. You and Ronnie used the word “pollution” because that bogus 50 - 90% figure for “pollution caused by trees” --:rolleyes:-- is used purely to support the political idea that automobile and industrial emissions limits need not be set “too low”.

Actually, natual terpene emissions CAN be a health risk.

I think it’s you that is drawing an artificial line. You are defining ‘pollutant’ as ‘man-made’. I don’t draw that distinction… Once a pollutant is in the air, it doesn’t matter if it came out of a tailpipe or an oak.

Some of the links I pointed to actually discuss health risks from urban vegetation due to various natural emissions. The conclusion in one of the links was that on balance the urban vegetation was a good thing, because other positive environmental factors outweigh the pollutants they emit.

From this cite,

Note that this cite is the first non-academic or government source I’ve posted, so take it for whatever veracity level you want.

Here’s a cite which details a grant request to study the effect of natural terpene emissions on groundwater in Alaska.

FromThis cite:

From this report at the EPA:

Here’s what the New Hampshire Department of Environmental Services has to say:

Note: I’m not drawing any conclusions here about the overall health effects of biogenic emissions of pollutants and man-made emissions. I just want to establish the following facts:

  1. Trees emit terpenes, a chemical which is considered a pollutant.
  2. Some forests, such as those in the Smoky Mountains, emit enough of it to cause a bluish haze.
  3. This haze is responsible for the name ‘Smoky Mountains’.

Thus answering the op: YES

While I maintain my belief that natural terpene is different than anthrogenic terpene (my understanding is that it is more rapidly degraded) I do cede to the information presented that natural terpenes can contribute to ground level ozone and smog, which have deleterious health effects, so therefore count as pollution.

Now as to that old Cherokee …

To the west of Sydney is a area known as the Blue Moutains . The source of the distinctive blue haze is the vaporation from the native trees of eucalyptus oil

“Industrial Uses of Eucalyptus Oil”

A few Eucalyptus species, mainly mallees, produce a leaf oil for which there is an existing limited world trade as a pharmaceutical product and a large potential market as an industrial solvent…

Eucalyptus oil based products have been used as a traditional non-ingestive treatment for coughs and colds (Opdyke, 1975), a topically applied medication for relief of muscular pain (Hong and Shellock, 1991), and as a solvent/sealer in root canal dentistry (Leung, 1980)…

It has uses as a fragrance in soaps, detergents and perfumes and as a flavouring in food (Furia and Bellanca, 197 1). Household uses include spot and stain remover and a wool wash component. It has also been used as a flotation agent in the mining industry (Clarke and Moore, 1931) ]
[/QUOTE]

Whether it would be valid to categorise something as ubiqitious as eucalyptus in Australia as a pollutant is not a question I’m qualified to answer, but my guess is no.

Daniel:

Thanks!

Just doing my bit to fight ignorance, you know. Ahem.

:cool:
Jammer:

Yea, verily, your grandfather sounds like a wise and learnéd man.
Sam:

I did? You were the one who originally brought them up in conjunction, back in that previous thread. I understood that you felt they were connected by the fact that the amount of isoprene produced by the biomass supported Reagan’s claims that 80% of the world’s pollution comes from “plants and trees.” May I ask, since you have not publicly recanted, if you still believe Reagan’s statement to be accurate?

No I didn’t. That particular moniker has been floating around for a couple of days now, thanks (I believe) to your friendly neighborhood elucidator. Clearly, you’ve not been keeping abreast of current SDMB developments.

See, this is what I don’t get. You seem to feel that you are within your full rights to insult other posters (like Elvis, in this thread), or to post hateful tripe such as the following:

…also a typical example of the misleading overgeneralizations you seem so fond of. And yet you feel insulted when paid back in kind? Well, gee, Sammy, awfully sorry to hurt your feelings, but if you can’t stand the heat, get out of the kitchen.

On the other hand, if you wish to be treated with respect, you might start by showing a little respect even towards those with whom you disagree.

With regard to your “Trees and Pollution” section, nothing you’ve cited from the DUSN, Berkley Campus News, or OGI contradicts the points I made in my OP – in fact, I used those sources myself in preparing it! To reiterate (since you didn’t directly address my response), isoprene itself is not a “pollutant,” as the term is commonly understood. Anthropogenic sources of NO must be available in order for the chemical reactions that produce ozone and smog to take place. If I’ve understood correctly, the chemical process proceeds in this manner:

isoprene + nitrous oxide = alkyl nitrate (a so-called “NOx,” in this case more specifically, isoprene nitrate); alkyl nitrate + ultraviolet radiation = ozone, nitrous dioxide, and peroxyacetylnitrate (i.e., “photochemical smog”)

Large amounts of NO are produced in urban areas in the form of exhaust from cars, various industries, and two-stroke lawnmower motors. The NOx (isoprene nitrate) detected by the Berkley team could only form because man-made pollutants were present as well. You’ll note that the team made no claim for having discovered “smog” in the Sierra Nevada forest, only unexpectedly high concentrations of NOx, and explained this finding by the fact that they were downwind of a major urban center (Sacramento).

But the point here remains that the specific statements made by Reagan, such as “Trees cause more pollution than automobiles do,” are massive oversimplifications, extremely disingenuous and misleading. Reagan simply prefers not to mention the fact that taken in isolation, 80% of the isoprene produced by trees rapidly breaks down into CO[sub]2[/sub], and that the remaining 20% reacts with sunlight to release micro-particles of carbon, which in turn function as condensation nuclei. As the TVA measurements indicate (not to over-generalize, mind you, but just as an example), the total quantity of these particles in the Smokies fluctuates somewhere between 2 and 6 micrograms/m[sup]3[/sup] of air, well below the EPA standard of 15 mg/m[sup]3[/sup] and an unknown amount of that total is also man-made.

By the way, without condensation nuclei, clouds would not form, and there would be no rain. In addition, the earth’s albedo would be significantly reduced, making our homeworld a much hotter place. Thus, the particles produced by isoprene emissions perform an absolutely vital function in the earth’s ecology, and I submit that the existence of a certain amount of fine particles in the atmosphere is absolutely necessary for our planet’s well-being and cannot therefore be reasonably classified as pollution. YMMV.

By promoting these claims, you seem intent as well on willfully misrepresenting these findings and perpetuating, rather than fighting, ignorance. You’ve stated, for example, that Reagan was “absolutely right,” even though he patently was not. You have yet to admit that this statement was less that correct. You’ve stated that trees emit “hydrocarbons and ozone,” when in fact they do not emit ozone. By twisting or flatly misrepresenting scientific findings, and combining fact with fiction, you present alarmist and misleading half-truths to support your political agenda. It appears that you don’t even fully understand the material you cite to support your case, as I pointed out to you regarding your interpretation of the TVA study.

Do you have any evidence for this claim, or are you simply assuming it to be so?

I’m running out of time IRL, now, but must briefly comment on your cites regarding the Smokies. The question here is, “Did the Smoky Mountains get their name from the pollution caused by all the trees?” which is what you have claimed, above. I’m going to get a little stiff-necked now, if you don’t mind.

Your first NOAA cite simply reiterates the points I’ve made above, and is irrelevant to the question.

You’ve quoted the passage from the University of Regina before; I avoided it because it contains no evidential backing, and is mentioned in an offhand and anecdotal manner in the body of the paper. Anyway, we may be at cross purposes here; originally, you referred to the “Smoky Mountains,” a stretch of the Appalachians that runs through Tennessee and North Carolina; this cite refers to the “Blue Smoky Mountains” of Virginia. I must admit I’ve never heard of the Blue Smokies before, so I’ll have to get back to you on it. Finally, the passage makes no reference whatsoever to the manner in which the Smokies got their name.

Your third cite, source unknown, is also irrelevant to the topic at hand, as far as I can tell.

Your fourth cite, a geology lecture, states (again without any evidential backing), that terpenes “cause the haze of the Smoky Mountains.” Again, as pointed out earlier, “haze” is the result of fine particles in the atmosphere, some of which are produced isoprene reacts with sunlight. In a roundabout way, then, this seems correct; and I am willing to concede that the condensation nuclei produced by the reaction of isoprene to sunlight leads to a higher level of water condensation in the atmosphere (i.e., fog) than one might find in an environment without such particles. The cite makes no mention whatsoever of how the Smoky Mountains got their name.

Your fifth cite, taken from a opinion piece, was written by Edmund Contoski in defense of some statistics he employed in his book, “Makers and Takers,” dedicated to showing “ how the free market works–and why government intervention doesn’t.” In it, he claimed that “ 93 percent of atmospheric CO is produced by nature and that this poisonous gas is produced by trees and other foliage.” Clearly, a reliable source, but I’ll stick with Jammer’s grandfather, if you don’t mind. Dr. McKenna provides no evidence to support his claim either, and this cite is little more than an appeal to authority.

I must round off now. Before I do though, I want to react to two other statements you’ve made:

Hardly a nitpick, as has been pointed out, quite well I think, by Daniel. Rather, a canard, which is why I started this thread in the first place. Did you not notice the title?

Wrong again, Sam. Terpene emissions contribute to 10 – 25% of the total amount of fine particles in the atmosphere, which is in turn only a fraction of the total pollution in the Smokies. There are scads of other sources of pollution – such as particle mass above the PM2.5 range, acid rain, and so on. And to repeat once again, a certain amount of micro-particles are necessary for the formation of clouds and so forth, and therefore cannot rightly be classified as pollution.

I’ll try to get back to the rest of this later in the evening, provided that Mrs. Svinlesha doesn’t bite my head off for wasting so much time here.
DSeid:

Nice to see you again.

:slight_smile:

In a previous thread, you had inquired about my son. Did you get my reply?

Just so I can keep track of the argument at this point it appears the main issues at odds in this discussion are -

1: How is term “pollution” characterized in considering the origin and components of a specific, localized atmospheric haze? Can naturally occurring atmospheric products of a segment of the carbon cycle (terpenes etc) be characterized as “pollution” in this haze?

2: Are some of these suspended atmospheric products of the carbon cycle in this haze (terpenes etc) critical to the observed nature of this haze being considered as a “smokey haze” and thus to the naming of the area or are these products not really relevant to the “smokiness” aspect regarding the origin of the name “Smokey Mountains”.

The first issue seems (to me) to be more of a semantic debate over the conceptual nature of what is and is not “pollution” than a strictly scientific debate as to the nature of the complex interplay of various hydrocarbons and other natural and man made substances in the atmosphere.

The second issue as to the terpenes etc. giving the the haze a unique “smokiness” (vs other hazes) and thus being responsible for the name “Smokey Mountains”, is largely unknowable at this point unless we have both a time machine and a way to test how removing these atmospheric components (in the past) would have affected the way they looked.