Abstract
An air sampling campaign conducted in eastern England, using a sampler in which ammonia is preseparated by a denuder, measured concentrations of aerosol strong acidity and related species. High concentrations documented at a coastal site were associated with air transported over the North Sea. Ammonia concentrations were elevated and the aerosol was more neutralized at inland sites. Aerosol hydrogen ion concentrations during the day exceeded those at night, probably because of more effective sulfuric acid production during daytime periods. Acidic aerosol concentrations were in the 0 78 nanoequivalents/m super(3) range.