PM2.5

Articles

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  Environment

  Delhi Logs Best September Air Quality in Five Years at AQI 102

  Delhi recorded a monthly average AQI of 102 in September 2026, the lowest September reading in five years, with 194 days under AQI 200 so far this year.

  30 September 2026 · 2 min read

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  Environment & Ecology

  Air Pollution and Air Quality: Pollutants, AQI and Laws

  Air pollution notes for exams: primary and secondary pollutants, London and photochemical smog, acid rain, PM2.5, the AQI categories and India's laws.

  28 September 2026 · 4 min read