India's cleanest city still far from safe air
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Tirunelveli, Tamil Nadu's "green energy capital" that hosts over 25% of the state's wind power capacity, earned the title of India's cleanest city in IQAir's 8th World Air Quality Report. Yet its annual PM2.5 levels remain well above safe thresholds—no Indian city hit the 0–50 "good" AQI range in 2025.
Loni near Ghaziabad in Delhi-NCR ranked as the world's most polluted urban area last year, with a PM2.5 average of 112.5 μg/m³—a 23% jump from 2024 and over 22 times the WHO guideline. Fine PM2.5 particles invade lungs and bloodstreams, fueling respiratory issues, heart disease, diabetes, and cancers like lung malignancies.
India dominates the crisis: three of the global top four most polluted cities—Byrnihat (Assam-Meghalaya border), Delhi, and Mullanpur (near Mohali)—lie here, alongside spots in Pakistan and China claiming the rest of the top 25. South Africa's Nieuwoudtville topped the world with a pristine PM2.5 average of 1 μg/m³.
Tirunelveli in Tamil Nadu, this emerging industrial hub, rooted in 3,200-year-old Porunai civilization and Sangam literature's five ecological landscapes, outpaced even northeastern standouts like Aizawl (Mizoram), Chamarajanagar (Karnataka), Shillong (Meghalaya), Kohima (Nagaland), and Gangtok (Sikkim).
India's PM2.5 averages often exceed WHO limits by fivefold. A 2024 Lancet study links long-term exposure to 1.5 million excess deaths yearly. In Delhi, air pollution drove 15% of 2023 deaths—surpassing many diseases.
Non-smoker lung cancer surges, with women now at 40% of cases and 10% in 30s-40s patients. Teens show lung blackening, once unimaginable. Chronic obstructive pulmonary disease (COPD) ranks second to heart disease in fatalities, underscoring decades of toxic air.