“New Delhi: It would be foolish to expect a dramatic improvement in Delhi’s air quality, especially in winter. However, pollution in the city plummeted to the “moderate” level on Friday, according to the Central Pollution Control Board (CPCB). The AQI, according to System of Air Quality and Weather Forecasting and Research (SAFAR), was “satisfactory”. On Thursday, it was in “very poor” zone…” The Times of India.  You’ve rain to thank for cleaner air
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