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Published July 4, 1997 | Published
Journal Article Open

Chemical Coupling Between Atmospheric Ozone and Particulate Matter


A major fraction of ambient particulate matter arises from atmospheric gas-to-particle conversion. Attempts to reduce particulate matter levels require control of the same organic and nitrogen oxide (NO_x) emissions that are precursors to urban and regional ozone formation. Modeling of the gas-aerosol chemical interactions that govern levels of particulate components showed that control of gas-phase organic and NO_x precursors does not lead to proportionate reductions of the gas-phase–derived components of atmospheric particles. The chemical coupling between ozone and particulate matter has implications for strategies to achieve the new ozone and particulate matter standards proposed by the U.S. Environmental Protection Agency.

Additional Information

© 1997 American Association for the Advancement of Science. 29 April 1997; accepted 17 June 1997. We would like to acknowledge support by the Electric Power Research Institute, the IBM Environmental Research Program, the U.S. Environmental Protection Agency Center on Airborne Organics, the State of California Air Resources Board, and NSF.

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