Abstract
Measurements of the chemical composition of rainwater and suspended particles collected in parallel at a rural site in North-West England have shown that sulphate, nitrate, chloride, sodium, magnesium and potassium exist in similar proportions in both media. However, rainwater shows a marked enhancement of H + and a corresponding decrease in NH 4 relative to aerosols. It is concluded that the major contribution to rainwater acidity at this site is due to sulphuric acid incorporated at cloud level. The scavenging of nitric or hydrochloric acids, or incorporation of acid sulphates close to ground level can account for only a minor contribution to acidity in this locality.
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