Abstract
Nitric acid (HNO 3) and particulate nitrate (PN) were sampled daily during the period November 1982 to October 1983 in Edmonton, Alberta. The mean HNO 3 and PN concentrations were 0.30 and 1.22 μg m −3, respectively. Each showed strong seasonal variations in concentration with the highest daily HNO 3 value of 2.4 μg m −3 being recorded in July and the highest PN concentration, 8.1 μg m −3, in December. The mean annual total nitrate (TN) concentration of 1.5 μg m −3 was lower than reported for cities such as Toronto, 2.9 μg m −3, but higher than the 0.51 μg m −3 found during the summer in Calgary, Alberta. A comparison of PN and HNO 3 values with peroxyacetylnitrate (PAN) concentrations shows PAN to be the most abundant reaction product of nitrogen oxides present in the Edmonton atmosphere by a factor greater than 2.5. The fractional conversion of NO x to PN, HNO 3 and PAN for the 12 month period was 0.034.
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