Cute, but the air in our cities is much better than it was and there are way more cars on the road now. Way more.
It's ok to admit that modern cars are better, guys, you won't get thrown out of your tribe if you say so. Or do you think it's fake news?
You know how you always look for both sides in the climate control debate, that maybe warming (even though it may not exist) might actually be good. I suggest that you look again at the industries set up to develop clean air and water technologies. Maybe there are two sides to that issue too. Maybe the various solutions they develop may cost more to implement at first, but that they will have long-term benefits. Try to look at both sides, just saying.
I agree with you about cars better at emitting less pollution. But now a lot of this is being controlled more and more by software as Alan pointed out about German made cars which I'ld also extend to American made models as well.
I"m more afraid of software in modern cars today than I am in my '92 Nissan Sentra's computer module to the point I'm fending off buying any used vehicle that was made after 2001 which is around the time Nissan switched from cabled throttle to "Fly By Wire" software regulated remote throttle control in all their models. Not sure about when the other brands did the same. Now a modern car's software can kill if it hasn't been updated.
https://www.thecarconnection.com/news/1116912_fca-tells-4-8m-vehicle-owners-to-stop-using-cruise-control-until-software-fixMy '92 Nissan Sentra's exhaust still smells wonderful compared to any year made American Chevy, Dodge or Ford truck which I have to role up my windows to avoid getting a headache from their exhaust at stop lights.
I just replaced my entire engine cooling system components (hoses, thermostat and radiator) last week at an Express Lube Plus and it was still cheaper than buying a ten year or newer used vehicle of any brand. No air bags, no cruise control, no power windows and no software to update in over 20 years. I'll have to buy a fleet vehicle similar to those U-Haul uses to get an electronically stripped down model similar to my simple Sentra.
And now my local weather man shows a new NASA satellite view to prove California's anti-pollution regulation standards are really working going by the global map from this article...
http://www.slate.com/blogs/bad_astronomy/2012/11/15/nasa_creates_computer_model_of_dust_storms_forest_fires_and_sea_salt.htmlHere's a 2017 video explaining NASA aerosol simulations...
https://www.youtube.com/watch?v=h1eRp0EGOmE