Caption: SWE - Proceedings of the First International Conference of Women Engineers and Scientists
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organic impurities in outdoor air is also large. The most common are methane and some other aliphatic hydrocarbon compounds, and mercaptanes. Table 4 presents the ranges of concentration of gaseous pollutants gathered from several cities in the U.S..A. Table 4 Ranges of Concentrations of Gaseous Pollutants Gathered from Several Cities in the U,S»A, Range of average concentration Range of maximum concentrat ion Maximum allowable concentration p_pm Pollutant ££S aldehydes (as formaldehyde) ammonia carbon dioxide hydrogen fluoride hydrogen sulphide nitrogen oxides ozone sulphuric dioxide 0.02 - 0.2 0,02 - 0.2 2.0 - 10.0 0,001 - 0.02 0.002 - 0.1 0.02 - 0.9 0.009 - 0.3 0.001 - 0.7 ££E 0.03 - 2.0 0.05 - 3.0 3.0 - 300 0.005 - 0.08 up to 1.0 0.3 - 3.5 0.03 - 1.0 0,02 - 3.2 5 100 100 3 20 5 0.1 5 The table indicates that the maximum allowable concentrations of impurities of air are exceeded only occasionally. Indoor air pollution In places of employment, thousands of various materials have been found contaminating the air which workmen have to breathe. The amounts of pollutants may be present in the local factory atmosphere in such concentrations that they exert injurious effects on workmen, work efficiency drops, and, when polluted air is breathed year after year, workmen's health may even be affected. Such pollutants include solutes such as benzene, tri- and perchlor ethylene and carbon tetrachloridsj gases like chlorine and sulphuric dioxide; and metals such as mercury, lead and arsenic, to mention only a few. Hazardous effects of aur pullutants The question which occupies our thoughts is concerned with the kinds of hazards to which peoply may be subjected by polluted air. The health problems brought about by air pollution mostly relate do the lungs or through the lungs to the blood, and in this way all over the body. The most well-known disease occasioned by dust is silicosis, a disease peculiar to workmen who have to breathe stone dust from year to year. Well-known 111-48
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