These agents are dust, industrial waste and industrial pollutants. Cities with heavy industries and vehicular transport can lead to pneumoconiosis, silicosis, lead poisoning etc.
Light-
Natural or artificial light is available at all places. Natural sunlight should be used wherever possible both for economy and for its beneficial effect on health. It is obtained by providing windows which should have an area of at least 1/10th of floor space. The rays of sun include visible rays, heat rays and invisible ultraviolet rays.in industries, inadequate lighting is uneconomical as the output leads to fall and the accident rate might increase. No worker should be permitted to gage directly at a bright light and every effort should be made to ensure that glazing light does not enter the eye obliquely.
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