I wouldn’t worry about the Hydrogen Sulfide. The “low-tide”, “rotten egg” smell of estuaries ( and sewage treatment facilities ) is due to H2S produced by anaerobic bacteria ( and a very few unique animals like Echiuran worms ) that use a sulfur-based metabolic pathway. And if you can smell it - It’s not dangerous. H2S ( You’ll have to excuse me - I don’t know the small code for vB ), is odorless at high concentrations because it deadens the sense of smell nearly instantaneously once it passes a certain threshhold concentration. In concentrations low enough to smell, it’s harmless, if unpleasant.
It’s a danger in treatment plants because it’s heavier than air and will sink into confined areas and accumulate. More than a few wastewater plant workers have died that way - It’s one of the deadliest hazards in the field. That’s why we have very stringent confined space entry rules, that include appropriate air-testing equipment. When I used to work in the “Digestors” section as a Plant Operator at a WWTP, I always used to carry a “sniffer” when doing my rounds in the underground pipe galleries to check for methane, O2 levels, and H2S ( the triple-threat of WWTP atmospheric hazards ). One thing we were trained to notice was that if you smelled H2S, then very suddenly the odor disappeared - Vamoose! It may mean that the concentration just passed into the olfactory nerve deadening level and you have a very short time indeed before it kills you. It’s very fast acting once it hits the danger threshhold - That’s why if you see a man down you NEVER go after them without testing the air first. If it’s bad enough it will take you out as well. There are documented cases of half-a-dozen or more operators dieing, one after the other, as they rushed in trying to pull out their buddies.
Put all the scary talk aside, the properties that make it so deadly ( its sinking, accumulating nature ), means it doesn’t spread readily ( although the odor is so intense it carries a very long way - all it takes is a few molecules to excite the olfactory nerve - that’s why those places can reek for miles ). No well-ventilated area is at risk. It will never get to threatening levels outside the confines of a vault somewhere at a treatment plant. WWT plants don’t tend to be a real health threat ( barring a massive chemical spill or an explosion of course ) to surrounding communities - They’re just annoying as hell.
However odor CAN make you nauseated and in my book, that’s the same as making you sick. If you can’t function fully because you feel like puking all the time, what difference is there?
Just because it can’t kill you, doesn’t mean you have to put up with it. No one should have to smell that crap unless they’re getting paid good money for it ( and yes, I’m happy to have switched from wastewater to water reclamation 
). All decent treatment facilities have odor-control programs, usually utilizing some combination of air-scrubbers and chlorination. Although they aren’t nearly 100% effective ( unless the place shells out for really expensive state-of-the-art stuff and has an appropriate design ), they should at least keep it at acceptable levels most of the time. Hell, we had a program where someone had to take a truck out every night and smell for odors at intervals, a few blocks out in every direction from our plant ( it was in a mixed industrial/residential area ). Not to mention that if we got a complaint, we were required to jump on it and check it out.
If you’re a mile away and its bad every single day ( as opposed to the occasional occurence - shit does happen, so to speak 
), I wouldn’t put up with it. Go scream at your local politician to crack down on these guys. They may have to spend money ( which may end up coming out as an increased sewage bill for you ). But there ARE solutions.
Postscript: The place I used to work now stinks to high heaven on the weekends when I drive by - That never would have been acceptable when I worked there 
. It’s all due to cost-cutting ( savings through reduced chemical feeds ) and local ( mostly poor and minority ) residents getting tired of constantly having to bitch and getting only a belated or sluggish response. It’s sad, but this nonsense is pretty common. That’s why bitching if you have the time and energy is a good thing. The squeaky wheel really does get the grease. Stop complaining and they’ll start trying to cut corners. Remember - odor control is a always a low operational priority and through habituation, those folks have a much higher tolerance than you.
Funny story: When they had little events at my old plant, like some award ceremony, they liked to hold it in the impressive looking roundhouse/lobby of our control building, which was dominated by a huge pit where 4 massive RAS ( Return Activated Sludge ) pumps were sited. The administration/main lab building was a separate facility. So they’d set up a buffet table. And being cheap, they never got enough food. All the admin and support types ( engineers, secretaries, etc. ) would get there at once and gobble all the food while the operators straggled in in ones and twos from their various stations ( which couldn’t be left completely unattended because it’s a 24-hour operation )to find all the good stuff gone. So some of the guys got the bright idea to bleed one of the out-of-service RAS pumps. The septic sludge from the line stank to high heaven and the support types fled outdoors. The operators and maintainence, used to far worse, casually strolled by and picked over the buffet tables in peace .
! And just to test…