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Record Search Query:
ServiceParameters>ENVIRONMENTAL ADVISORIES>HEALTH ADVISORIES>HUMAN HEALTH ADVISORIES
Local Trends in Nitrogen Dioxide Levels
Entry ID: EPA_AIR_TRENDS_NITROGEN
Summary
Abstract:
Using a nationwide network of monitoring sites, EPA has developed ambient air quality trends for nitrogen dioxide (NO2). Trends from 1980-2008 and from 1990-2008 are shown here. Under the Clean Air Act, EPA sets and reviews national air quality standards for NO2. Air quality monitors measure concentrations of NO2 throughout the country. EPA, state, tribal and local agencies use that data to ensure that NO2 in the air is at levels that protect public health and the environment. Nationally, average NO2 concentrations have decreased substantially over the years.
[Summary provided by the EPA.]
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