Aspects of the Parameterization of Transformation and Removal Processes in Air Quality Modelling

  • Øystein Hov
Part of the Nato — Challenges of Modern Society book series (NATS, volume 7)

Abstract

The air quality is linked to the ambient air concentration of species like ozone (O3), nitrogen dioxide (NO2), peroxyacetylnitrate (PAN), aldehydes, carbon monoxide (CO), sulphur dioxide (S02), sulphate (SO4 =), nitric acid/nitrate (HNO3/NO3 -), soot and many other types of particulate material (containing trace metals, hydrocarbons, chlorinated hydrocarbons etc.). Ozone alone, or in combination with SO2or NO2/ is responsible for up to 90% of the crop losses in the U.S. caused by air pollution. An estimate made for the U.S., assuming that all areas just met the current O3 standard of 120 ppb as hourly average, showed a loss of 2 to 4% of the crop production. A test program, utilizing field chambers where the ozone concentration could be controlled, demonstrated yield reductions in all crops at seasonal 7h/day mean O3 concentrations of 60 – 70 ppb when compared with a control value of 25 ppb, thought to represent the natural background (Heck et al., 1982).

Keywords

Benzene Toluene Aldehyde Carbon Monoxide Alkane 

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Copyright information

© Plenum Press, New York 1985

Authors and Affiliations

  • Øystein Hov
    • 1
  1. 1.Norwegian Institute for Air ResearchLillestrømNorway

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