Santiago Sees Cleaner Winter Air After Decades of Pollution-Control Measures

This winter, Santiago’s mountains were visible more days than usual, highlighting a significant drop in smog. Decades of air pollution mitigation policies are now paying off: critical episodes of fine particulate matter (PM2.5) fell by 66% over the last decade, making 2025 the third best year since Chile’s first atmospheric decontamination plan in 1997. Measures such as modernising public transport, banning wood-burning heaters in winter, and vehicle circulation restrictions have contributed to the improvement. Compliance has increased, with wood-burning violations down 88% and traffic restrictions better followed. Electric buses now make up 30% of the 9,000-unit fleet, easing pollution peaks.

Despite these gains, experts warn challenges remain: ozone levels rise in summer, and home electrification lags due to energy poverty. Residents report improved health, particularly for children, and fewer respiratory issues. While Santiago’s winter air shows real progress, continued policy enforcement and investment are needed to sustain cleaner air year-round.

07-10-2025