Criteria Pollutants-are the six
major pollutants (CO, Pb,
NO2, O3,
PM, SO2)
that EPA has set standards for. EPA has two kinds of trends, Air
Concentration- which is based on actual measurments of pollutants
in the outside air at selected monitoringsites throughout the country.
Also, Emissions-are based on engineering estimates of total
tons of pollutants released into the air each year. Some effects
of the criteria pollutants can be numerous on humans like increased
respiratory symptoms, hospitalization from heart and lung disease,
and premature death.
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