Data: American Lung Association; Note: Days where air pollution was worse received a greater weighting in the calculation; Chart: Alex Fitzpatrick/Axios Houston continues to be one of the most ...
New Delhi: In 2015-16, Delhi had 69 ‘very poor’ air quality days, with AQI between 200-300, from October to January. Ten years later, after the imposition of GRAP or other pollution measures, there ...
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