How are ambient air quality standards set?
The Children’s Environmental Health Protection Act (CEHPA, California Senate Bill 25, Escutia, 1999) required the ARB and Office of Environmental Health Hazard Assessment to evaluate all ambient air quality standards by December 2000 to determine whether these standards adequately protect human health, particularly that of infants and children. The CEHPA also required staff to prioritize those standards found to be inadequate for full review and possible revision. The evaluation found that health effects may occur in infants, children, and other potentially susceptible groups exposed to pollutants at levels near several of the current standards, with PM10, ground-level ozone (O3) and nitrogen dioxide (NO2) receiving the highest priority for review and possible revision.
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