It's probably either the United States (because that nation is a large, very industrialized nation with lots of automobiles) or China (because they're also a large, becoming more and more industrialized nation, with a growing number of automobiles, and also they tend not to have stringent pollution controls).
"lead" is the air pollutant that decreased most in 1970 to 1991.
Ozone is considered to be the most common air pollutant in the United States.
Carbon dioxide is the air pollutant that most concerns Americans.
Yes it can, if the pollutant is a volatile substance,but most of the time when the pollutant is dissolved or mixed with the water,when evaporation occurs any waste caught in the water will be left behind.This causes the water pollution to become worse with time.
Radon is an indoor air pollutant that can be a warning to home owners.
high-pollutant gasoline
Acid rain most likely.
Lead
the US of A
The most toxic 'metal' pollutant would be lead.Other pollutants present in the automobile exhaust are:HydrocarbonsNitrogen oxidesCarbon MonoxideCarbon Dioxide
You.
CO2.