Strictly as a layman. I think they need to get samples of that crap, and try spray various things on it, to see what kills it on contact.
Wouldn’t be ironic if all you had to do is breath in some lacquer thinner fumes? Or Diesel Fumes behind a bus. 🙂 Or sniffing Glue? I remember watching a Forensic Files episode one night and where the wife puts small amounts of arsenic in her husbands soup, and it took a long time to kill him gradually.
After that I don’t worry about whats in the food so much. We are pretty indestructible. And now that I’m thinking about this. We used to burn coal to heat houses, none of the cars were burning clean exhausts. and we NEVER had to wear face masks.
That means the air around us is potentially dangerous to inhale, but NOT any of the other things. You have a problem with Smog? Move. It won’t kill ya.