Mortality Studies May Help Bolster Case For Stricter PM2.5, Ozone NAAQS

Major epidemiological studies are again suggesting early deaths from exposure to fine particulate matter (PM2.5) and ozone at levels of pollution below EPA’s current national ambient air quality standards (NAAQS) for the two criteria pollutants, potentially bolstering calls by environmentalists and others for the agency to tighten the limits. The Health Effects Institute (HEI), a Boston-based research body jointly funded by EPA and industry, in recent research reports highlights the provisional findings of U.S. and Canadian studies on exposure to...