Long-Term Trends in Reactive Nitrogen Deposition in the United States.

Long-term monitoring of ambient air quality and deposition is necessary to characterize trends in human and ecosystem exposure and to gauge the effectiveness of air pollution control programs. Such datasets are rare because of the difficulty and capital required to consistently and accurately collect and analyze samples over time from a spatially adequate number of regionally representative sites. Most of the national air pollutant monitoring networks producing these datasets were established in the 1970s and 1980s and focused on the human health-based National Ambient Air Quality Standards (NAAQS) criteria pollutants (e.g. sulfur dioxide (SO2), nitrogen dioxide (NO2), ozone (O3), particulate matter < 2.5 μm (PM2.5)) or reporting acid rain trends and visibility impairment.

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