* కరోనా వివత్కర కాలంలో నవు ఇంటి వద్ద ఎదుర్కొన అనుభవాలు యండి రాయండి.
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There are four main types of air pollution sources: mobile sources – such as cars, buses, planes, trucks, and trains. stationary sources – such as power plants, oil refineries, industrial facilities, and factories. area sources – such as agricultural areas, cities, and wood burning fireplaces.
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