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Delhi's air quality slipped back into the "poor" category on Saturday, a day after it had improved significantly due to favourable wind speed. The city's air quality index (AQI) was 209 at 9 am. The 24-hour average AQI was 137 on Friday, 302 on Thursday and 413 on Wednesday. Stronger winds and reduction in stubble burning were two major reasons for cleaner skies on Friday.
from Delhi News: Latest Delhi News Headlines & Live Updates from Delhi - Times of India https://ift.tt/2V9hmgK
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