rom
1900 to 1970, six widespread pollutants increased dramatically in the
air we breath. Scientists studying the effects of air pollution on our
health and welfare found undeniable evidence that exposure to specific
levels of each of these 6 criteria pollutants
for a certain amount of time was harmful and should be avoided. We began
monitoring air quality to test these pollutant levels.
rom
1900 to 1970, six widespread pollutants increased dramatically in the
air we breath. Scientists studying the effects of air pollution on our
health and welfare found undeniable evidence that exposure to specific
levels of each of these 