1. Intersociety Committee (1972) Methods of Air Sampling and Analysis, American Public Health Association, Washington.
2. ASTM (1981) Standard Recommended Practice for Planning the Sampling of the Atmosphere, D1357–57, Part 26. In ASTM Annnual Book of Standards, American Society for Testing and Materials, Philadelphia, Pa.
3. American Industrial Hygiene Association (1972) Air Pollution Manual. Part I Evaluation, 2nd edn, AIHA, Detroit.
4. National Air Sampling Network, US Environmental Protection Agency, Washington, DC.
5. National Air Pollution Surveillance, Annual Summaries, Air Pollution Control Directorate, Environmental Protection Service Environment Canada, Ottawa, Canada.