Delhi Secures Second-Best January Air Quality in Five Years With Average AQI 307

Delhi recorded an average Air Quality Index (AQI) of 307 in January 2026, making it the second-best January for air quality in the past five years, according to an analysis by the Centre for Research on Energy and Clean Air (CREA). Despite the ranking, the data shows a marginal deterioration compared to January 2025, when the average AQI stood slightly lower at 306 during the same period.

CREA’s analysis highlighted that January 2025 was the cleanest January since 2022, with a monthly average AQI of 306, while January 2022 recorded a significantly better average of 279. Based on these figures, January 2026 now ranks second-best among January air quality levels recorded over the last five years, reflecting a mixed trend in Delhi’s persistent pollution challenge.

During January 2026 so far, the national capital experienced two “moderate” air quality days, 12 “poor” days, 14 “very poor” days, and two “severe” days. In contrast, January 2025 saw two “moderate” days, 13 “poor” days, and 16 “very poor” days, with no “severe” air quality days reported throughout the month.

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The presence of two “severe” pollution days in January 2026 is believed to have contributed to the slightly higher average AQI this year, according to the analysis. Experts noted that the absence of any “severe” days in January 2025 played a key role in keeping last year’s overall average marginally lower.

Looking ahead, the air quality early warning system has forecast “very poor” air quality for January 31, indicating continued pollution concerns for residents. Authorities have urged citizens to remain cautious, especially vulnerable groups such as children, the elderly, and those with respiratory conditions.

As per the Central Pollution Control Board (CPCB), AQI values between 0 and 50 are classified as “good,” 51–100 as “satisfactory,” 101–200 as “moderate,” 201–300 as “poor,” 301–400 as “very poor,” and 401–500 as “severe.” These benchmarks are used nationwide to assess health risks and guide public advisories.

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