In 2024, Delhi recorded ** percent of monitored days when PM2.5 levels exceeded India's daily National Air Quality Standards (NAAQS) 24-hour standard of ** 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 *** 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 ** μ²µ/³¾3.
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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 ÌÇÐÄÆƽâ°æ. Retrieved July 31, 2026, from /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. ÌÇÐÄÆƽâ°æ. Accessed July 31, 2026. /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. ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 31, 2026. /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." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 9 Jan 2025, /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 ÌÇÐÄÆƽâ°æ, /statistics/1563218/percent-of-days-exceeding-pm25-limits-in-india-by-city/ (last visited July 31, 2026)
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: /statistics/1563218/percent-of-days-exceeding-pm25-limits-in-india-by-city/
