Question

What is the average number of pollutants checked for in

Answer 1

NAAQS are currently set for carbon monoxide, lead, ground-level ozone, nitrogen dioxide, particulate matter, and sulfur dioxide. for six common air pollutants (also known as "criteria air pollutants.

In developing countries, 70 percent of industrial wastes are dumped untreated into waters, polluting the usable water supply. On average, 22 million tons of fertilizers and chemicals are used each year.