Pollution in Delhi worsened today as the air quality reached the 'unhealthy' category as stubble burning in Punjab and Haryana has begun. Burning of paddy straw every year in the months of October and November in Punjab and Haryana is one of the major contributors of air pollution in Delhi and its neighbouring cities. The smoke and fine particulate matter pollute most of northwest India, especially the national capital. The air quality in north India worsens drastically during the winter months, with heavy smog covering the region. Delhi and nearby cities, the most populous region in the country, are the worst affected when particles from stubble burning combine with industrial pollution, vehicular emission and dust due to construction. Adults and children with respiratory disease, such as asthma, must avoid prolonged outdoor exertion in this pollution in Delhi.
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