Air quality index for PM2.5- particulate matter 2.5 extremely hazardous- reached 285 on November 9, 2023. The thick smoke was visible on NASA satellite imagery. Much of it come from burning of paddy rice straw after the rice harvest in states of Haryana and Punjab near New Delhi. Governments at the federal level and state levels have failed to stop the burning of stubble. The fire smoke adds to pollutants from industrial activities, and pollution from cars and buses. The first week of November and last week of October was when fire activity happened this year, delayed after monsoon rains.
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