Abstract
AMONG the reactions of primary pollutants with one another and with substances naturally present in air, the reactions induced by light are particularly important. The occurrence of such reactions is related to the accumulation of strongly oxidizing species, particularly ozone1, which occurs naturally in the atmosphere to the extent of 20–50 p.p.b. during daylight2,3. Ozone can be detected by smell by sensitive individuals at 100 p.p.b.4, which value is a suitable threshold for an air quality evaluation, having been proposed as an air quality standard in the USA5.
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References
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Atkins, D. H. F., Cox, R. A., and Eggleton, A. E. J., Nature, 235, 372 (1972).
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DERWENT, R., STEWART, H. Elevated Ozone Levels in the Air of Central London. Nature 241, 342–343 (1973). https://doi.org/10.1038/241342a0
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DOI: https://doi.org/10.1038/241342a0
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