Caeté Air Quality Index (AQI)

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Caeté, nestled in the state of Minas Gerais, Brazil, occupies a unique geographic position within the Iron Quadrangle, a region historically significant for its iron ore mining. The city sits at an elevation of approximately 728 meters (2388 feet) above sea level, contributing to a cooler climate compared to lower-lying areas of the state. The surrounding landscape is characterized by rolling hills, remnants of ancient geological formations, and patches of Atlantic Forest, though significantly altered by mining activities. Caeté’s terrain is undulating, influencing local wind patterns and pollutant dispersion. The proximity to extensive open-pit iron ore mines and processing facilities is a dominant factor in its air quality profile. Agricultural zones, primarily focused on coffee and dairy farming, are present in the surrounding rural areas, contributing to seasonal biomass burning. The urban-rural gradient is relatively sharp, with the city centre densely populated and transitioning quickly to agricultural and mining landscapes. This concentrated industrial activity, combined with the topography, can lead to localized air pollution events, particularly during periods of low wind speed and temperature inversions. The lack of substantial bodies of water nearby limits evaporative cooling and can exacerbate particulate matter concentrations. The Iron Quadrangle’s geological composition also contributes to naturally occurring asbestos fibres in the air, a long-term health concern.

Caeté experiences a distinct wet and dry season, rather than traditional four seasons. The dry season, spanning roughly May to September, is typically characterized by lower humidity and increased dust and particulate matter concentrations. This is due to reduced rainfall, drier vegetation, and increased activity from mining and agricultural operations. Wind patterns during this period can be less consistent, leading to stagnant air and pollutant build-up. October to April marks the wet season, bringing relief from particulate pollution as rainfall effectively washes pollutants from the atmosphere. However, increased humidity can also promote the formation of secondary pollutants. February and March, the peak of the rainy season, generally offer the best air quality for outdoor activities. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should be particularly cautious during the dry season, limiting strenuous outdoor activity and monitoring their health. Temperature inversions, common during cooler nights throughout the year, can trap pollutants near the ground, worsening air quality even during the wet season. Biomass burning associated with agricultural practices in surrounding areas contributes to spikes in particulate matter during the transition between seasons.