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Secondary Aerosols Fuel Delhi PM2.5 Crisis

Secondary Aerosols Deepen Delhi’s PM2.5 Crisis Why in the News? A recent Centre for Research on Energy and Clean Air (CREA analysis) reveals that nearly one-third of Delhi’s annual PM2.5 load comes from secondary aerosols, especially ammonium sulfate, highlighting the role of coal-based SO₂ emissions, atmospheric chemistry, and regional pollution in worsening winter smog. This …

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