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India’s Air Quality Crisis Deepens: Delhi Ranked Sixth Most Polluted City in October 2025
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A recent study reveals a concerning deterioration in air quality across India, with Delhi ranking as the sixth most polluted city in October 2025. The findings, released by the Center for Research on Energy and Clean Air (CREA), underscore the urgent need for thorough and sustained action to combat the nation’s escalating pollution crisis.
NCR Bears the Brunt of Air Pollution
The study, based on continuous ambient air quality monitoring data, highlights the Indo-Gangetic Plain, and specifically the National Capital region (NCR), as experiencing the most notable declines in air quality. Dharuhera, Haryana, emerged as the most polluted city overall during October, registering an alarming average PM2.5 concentration of 123 g/m. This figure dramatically exceeded the National Ambient Air Quality Standard (NAAQS) on 77% of the days.
The city endured two days categorized as “Severe” and nine as “Vrey Poor,” painting a stark picture of the persistent pollution challenges. Delhi’s monthly average PM2.5 level reached 107 g/m – nearly three times the 36 g/m recorded in September – illustrating a rapid and deeply troubling increase in air pollution.
Beyond Seasonal Factors: A Year-Round Problem
While stubble burning contributed to less than 6% of Delhi’s particulate matter in October, the overall surge in pollution levels points to consistent, year-round emission sources. This finding casts doubt on the effectiveness of short-term measures like the Graded Response Action Plan (GRAP), suggesting a need to move beyond reactive strategies. “The data clearly indicates that pollution isn’t just a seasonal issue,” a senior official stated. “We need to address the fundamental sources of emissions.”
A Regional Crisis: Top Polluted Cities
The top 10 most polluted cities where largely concentrated within the NCR and Haryana, including Rohtak, Ghaziabad, Noida, Ballabgarh, Bhiwadi, Greater Noida, Hapur, and Gurgaon. In contrast, Shillong in Meghalaya stood out as the cleanest city, with an average PM2.5 concentration of just 10 g/m. karnataka and Tamil Nadu also featured prominently among the cities with the best air quality.
Global Standards Remain Elusive
Despite 212 out of 249 cities meeting India’s NAAQS limit of 60 g/m, a mere six cities adhered to the World health Organisation’s stricter daily safe guideline of 15 g/m. The number of cities experiencing “Good” air quality plummeted from 179 in September to just 68 in October, signaling significant hurdles in managing air pollution during the colder months. “
Urgent Action Needed
This grim scenario demands immediate and sustained policy interventions to safeguard public health and protect the environment, not only in the NCR but across the contry.The data underscores the critical need for robust, long-term mitigation strategies targeting emissions from vehicles,
