Brazil's most polluted cities 2022
Acrelandia, located in the northern state of Acre, was the most polluted city in Brazil in 2022, based on fine air particulate matter concentration (PM2.5). Throughout the year, the city had an average particulate matter concentration of 23.3 micrograms per cubic meter. The World Health Organization's air quality standards recommend a maximum annual average concentration of 10 μg/m³. Four of the top five most polluted cities in Brazil that year were located in the state of Acre.