Delhi tops list of world’s most polluted capital cities in 2023

Syllabus: GS-III ; Subject: Current affairs ; Topic: Indices and reports, Issue: Most polluted city.

Context: Delhi ranked as the most polluted capital city globally and the third most polluted city in India.


  • India ranked third globally in PM 2.5 levels, with over 66% of its cities reporting levels exceeding 35 µg/m3.
  • Prolonged exposure to PM 2.5 particles poses health risks such as cardiovascular and neurological diseases.

Prelims Connect(Terminology in news)

Particulate Matter 2.5

●     Refers to fine inhalable particles with a diameter of 2.5 micrometers or less.

●     Health Effects: Irritation, coughing, reduced lung function, increased mortality.

●     Outdoor Sources: Vehicle exhaust, industrial emissions, burning fuels, forest fires.

●     Indoor Sources: Tobacco smoke, cooking, burning candles, heaters/fireplaces.

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