2025, rising to 17.2 μg/m3 from 16.6 μg/m3 in 2024. Despite this slight gain, long-term trends remain encouraging. In 2025, Chile expanded its monitoring network to 72 cities, with eu uain sueouis Auenoed s! ssiod sui 'to on paeduo uonn % ue mes the region was struck by a severe polar anticyclone in June and July, which brought record- breaking cold and heightened the demand for residential wood heating.9 Furthermore, two cities, Punta Arenas and Cuncumen, successfully met the WHO annual PM2.5 guideline level. While broad improvements are visible in many regions,the capital city of Santiago saw 'o u swr gi' Aq buisu 'slal g'd aae lnuue ui aseau ms Coyhaique continues to rank as the country's most polluted city, highlighting the ongoing struggle to mitigate wood-burning emissions in southern regions. Residential wood barriers impede atmospheric ventilation, creating a topographic basin that prevents the stagnant conditions by trapping smoke and exhaust close to the ground, preventing the vertical mixing of air and sustaining high concentrations of PM2.5. Program (UNEP), launched the $5.3 million Net-Zero Nature-Positive Accelerator Program.95 This initiative targets the decarbonization of energy demand and the advancement of sustainable mobility, addressing two of the country's primary sources of PM2.5 emissions. Additionally, the program focuses on forest and wetland restoration to mitigate wildfire risks, another major contributor to air pollution. By aligning environmental, energy, and finance policies, this initiative aims to drive the systemic shifts necessary to decrease pollution levels Annual hours spent at different PM2.5 pollution levels and significantly improve public health outcomes.