Most polluted cities based on PM2.5 concentration in Chile 2023

Coyhaique, located to the east of the Andes mountain range, was the most polluted city in Chile in 2023, based on fine air particulate matter concentration (PM2.5). Throughout the year, the city had an average particulate matter concentration of 33.2 micrograms per cubic meter. Coyhaique also ranked as the most polluted city in Latin America that year. The World Health Organization's air quality standards recommend a maximum annual average concentration of 10 μg/m³. Chile's capital Santiago reported an average PM2.5 concentration of 21.3 μg/m³ that year.