Air Pollution
Delhi rolls out GRAP IV vehicle curbs as AQI hits 358 amid fog chaos
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Following Tuesday's announcement, Delhi enforced the entry ban on non-BS-VI private vehicles from outside the city and 'No PUC, No Fuel' rule on December 18, 2025. AQI soared to 356-358 in 'very poor' category amid dense fog slashing visibility to 100m, disrupting flights and trains, though winds may aid dispersion later.
Air quality in Mexico City and the State of Mexico improved, preventing a new ozone contingency activation amid a heat wave. At 3 p.m., only the Tlalpan station reported poor quality, Cuajimalpa good, and the rest acceptable. The Megalopolis Environmental Commission (CAMe) lifted the weekend contingency and keeps alerts for atmospheric stability conditions.
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Nearly one in 10 homes tested in the UK, Italy and the Netherlands showed benzene levels from gas cooker leaks that surpass safety limits, according to researchers. The cancer-causing chemical in natural gas poses risks akin to secondhand smoke indoors. The findings highlight potential indoor air pollution from slow leaks.
Delhi's air quality has improved sharply, with the average AQI reaching 271 in the poor category, down from severe levels in previous days. The Commission for Air Quality Management has revoked stage IV of the Graded Response Action Plan, though stage III remains in effect. However, forecasts indicate the situation may worsen again in the coming days.
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Following the December 18 launch of 'No PUC, No Fuel' and entry bans for non-BS-VI vehicles, Delhi Traffic Police inspected 2,768 vehicles at borders, turning back 460 non-compliant ones and issuing 289 challans amid air pollution fight. Limited checks at Badarpur allowed some entries unchecked.
Delhi's air quality remained in the very poor category on Friday, with the overall AQI rising to 384 and multiple stations recording severe levels above 400. The pollution is expected to persist over the coming week, affecting the National Capital Region. In Mumbai, air quality also worsened, prompting enforcement actions.
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Attacks in the Red Sea forced ships to detour around the Cape of Good Hope, creating a natural experiment that revealed how cleaner marine fuels reduce cloud formation. Researchers found that low-sulfur fuels cut the cloud-boosting effect from ship emissions by about two-thirds. This discovery helps refine climate models and highlights trade-offs in pollution regulations.
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