In 2024, Delhi recorded 68 percent of monitored days when PM2.5 levels exceeded India's daily National Air Quality Standards (NAAQS) 24-hour standard of 60 micrograms per cubic meter of air (μg/m3). This was the highest proportion of PM2.5 daily exceedances among India's most populated cities that year. In comparison, just two percent of monitored days exceeded PM2.5 NAAQS in Chennai. However, India's daily NAAQS for PM2.5 is far less strict than the World Health Organization air quality guideline of 15 μg/m3.
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Share of days when PM2.5 levels exceeded air quality limits in the most populated cities in India in 2024
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Centre for Research on Energy and Clean Air. (January 9, 2025). Share of days when PM2.5 levels exceeded air quality limits in the most populated cities in India in 2024 [Graph]. In Statista. Retrieved July 07, 2025, from https://www.statista.com/statistics/1563218/percent-of-days-exceeding-pm25-limits-in-india-by-city/
Centre for Research on Energy and Clean Air. "Share of days when PM2.5 levels exceeded air quality limits in the most populated cities in India in 2024." Chart. January 9, 2025. Statista. Accessed July 07, 2025. https://www.statista.com/statistics/1563218/percent-of-days-exceeding-pm25-limits-in-india-by-city/
Centre for Research on Energy and Clean Air. (2025). Share of days when PM2.5 levels exceeded air quality limits in the most populated cities in India in 2024. Statista. Statista Inc.. Accessed: July 07, 2025. https://www.statista.com/statistics/1563218/percent-of-days-exceeding-pm25-limits-in-india-by-city/
Centre for Research on Energy and Clean Air. "Share of Days When Pm2.5 Levels Exceeded Air Quality Limits in The Most Populated Cities in India in 2024." Statista, Statista Inc., 9 Jan 2025, https://www.statista.com/statistics/1563218/percent-of-days-exceeding-pm25-limits-in-india-by-city/
Centre for Research on Energy and Clean Air, Share of days when PM2.5 levels exceeded air quality limits in the most populated cities in India in 2024 Statista, https://www.statista.com/statistics/1563218/percent-of-days-exceeding-pm25-limits-in-india-by-city/ (last visited July 07, 2025)
Share of days when PM2.5 levels exceeded air quality limits in the most populated cities in India in 2024 [Graph], Centre for Research on Energy and Clean Air, January 9, 2025. [Online]. Available: https://www.statista.com/statistics/1563218/percent-of-days-exceeding-pm25-limits-in-india-by-city/
