and human studies provide information about a substance’s level of hazard.
Scientists use the results of such studies to estimate the likelihood of
illness at different levels of exposure.
|Exposure to toxic
air pollutants can increase your health risks. For example, if you live near a factory
that releases cancer-causing chemicals and inhale contaminated air, your risk
of getting cancer may increase. Breathing air toxics could also increase your
risk of noncancer
effects such as emphysema, asthma, or reproductive disorders.
concentrations of air toxics are compared to concentrations associated with
chronic exposure risk levels derived from scientific assessments conducted by
the EPA and other environmental agencies.
These risk levels provide a frame of reference to put air toxics
concentrations into perspective.