Abstract
Measurements of HONO and HNO 3 have been made using annular denuder samplers at sites in south-east England. Whilst concentrations of HNO 3 exhibited a diurnal variation, with a maximum in mid-afternoon nitrous acid shows the opposite diurnal cycle with maximum levels at night due to daytime photolysis. Concentrations of HONO increase with those of NO 2, and elevated nighttime HONO level appear to be followed by high levels of HNO 3 the following day. Average concentrations of HONO (0.45± 0.26 ppb in 24 h samples are comparable to those of HNO 3 (0.56±0.36 ppb in 24 h samples), each representing about 5–10% of the concentration of NO 2. Although NO 2 oxidation provides the source of HNO 3 concentrations of the two compounds are not related, presumably since the formation of NH 4NO 3 aerosol limits HNO 3 concentrations at out site.
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