Acre, Brazil Sees Significant Improvement in Air Quality Indicators

The state of Acre in Brazil has recorded a substantial improvement in air quality indicators, with a 94% reduction in atmospheric pollutant concentrations in the first three days of September this year compared to the same period in 2024. This significant drop is attributed to the implementation of pollution prevention and control measures, which have resulted in improved air quality, reduced health risks, and increased visibility. Governor Gladson Cameli emphasized the importance of joint efforts to combat environmental crimes, such as deforestation and illegal burning, and to reinforce prevention, inspection, and education actions.

Key Takeaways:

• The Integrated Center for Geoprocessing and Environmental Monitoring (Cigma) plays a strategic role in monitoring the state's environmental indicators.
• In 2024, several cities in Acre were blanketed by smoke in early September, prompting the government to issue alerts and cancel the traditional September 7th parade.
• The average concentration of PM2.5 particulate matter reached 234 mg/m3 in 2024, classifying the air quality as poor.
• In 2025, the observed average concentration was 12.61 mg/m3, classifying the air condition as good, within the range of 0 to 25 mg/m3.
• The monthly average for PM2.5 particulate matter in August 2025 was 13.70 mg/m3, well below the 41.65 mg/m3 recorded in the same period in 2024.
• The improvement in air quality indicators has a direct impact on the population's health, reducing the risk of respiratory diseases and increasing safety for vulnerable groups.
• The state of Acre has implemented integrated actions to combat environmental crimes, such as deforestation and illegal burning, and to reinforce prevention, inspection, and education actions.

Statistics:

• 94% reduction in atmospheric pollutant concentrations in the first three days of September this year compared to the same period in 2024.
• 234 mg/m3 average concentration of PM2.5 particulate matter in 2024.
• 12.61 mg/m3 observed average concentration in 2025, classifying the air condition as good.
• 41.65 mg/m3 monthly average for PM2.5 particulate matter in August 2024.
• 13.70 mg/m3 monthly average for PM2.5 particulate matter in August 2025.
• 73.4% drop in wildfires between August 1st and 31st in 2025, compared to the same period in 2024.
• 517 active hotspots identified as of August 30, 2025.
• 1,997 hotspots identified in the same period in 2024.

Sources:

• "Com queda de 94 na poluição do ar, setembro começa mais limpo e com previsão de chuvas acima da média" (Agência AC)
• "Cigma – Centro Integrado de Processamento de Geoprocessamento e Monitoramento Ambiental" (Secretaria do Estado do Meio Ambiente de Acre)