EFFECT OF A POLLUTING SOURCE ON THE AIR-QUALITY DOWNWIND OF PRISTINE NORTHERN AREAS

The diurnal variations during summer and winter of the concentrations of NO, NO2, O3 and hydrocarbons downwind from a polluting source in pristine areas are calculated using a chemically oriented expanding box model. It is found that during the summer high ozone levels could be expected in the afternoon, particularly from a mixture originally emitted between 6 and 10 a.m. Under identical conditions high ozone levels are not predicted at any time of the day during the winter. HO2NO2 is predicted to be present at higher levels than PAN during the winter, whereas during summer the reverse situation obtains. © 1979.