Abstract
An intensive field study of atmospheric nitrogenous pollutants was conducted at a Los Angeles area smog receptor site, during selected 1980 air pollution episodes. Highest 4-h averaged concentrations were 47 ..mu..g m/sup -3/ for particulate nitrate (NO/sub 3//sup -/) and 36 ..mu..g m/sup -3/ for nitric acid (HONO/sub 2/). HONO/sub 2/ and NO/sub 3//sup -/ exhibited opposite diurnal variations. The highest peroxyacetyl nitrate (PAN) concentration recorded was 47 ppb. Methyl nitrate was consistently observed at trace levels ( .. PAN and NO/sub x/ ..-->.. HONO/sub 2/ + NO/sub 3//sup -/, PAN formation constitutes a major sink for atmospheric NO/sub x/. On a nitrogen basis, PAN accounted for approx.60% of the NO/submore » x/ oxidation products.« less
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