NASA-based analysis shows ammonium sulphate forms nearly one-third of annual PM2.5, driven by chemical reactions rather than direct local emissions.

Starting next year, Kumar said, the ministry will also track students failing Class 10 and 12 using Unified District Information System for Education (UDISE) Plus data ...

Around one-third of Delhi’s annual PM2.5 pollution is made up of secondary ammonium sulfate, with its share rising sharply during the city’s worst po ...

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