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Itaguara, nestled in the state of Minas Gerais, Brazil, occupies a geographically complex position within the southeastern region. Located at coordinates -20.3919, -44.4878, the city sits amidst a rolling landscape characteristic of the Brazilian Highlands. Its elevation, approximately 750 meters above sea level, influences local weather patterns and contributes to the potential for temperature inversions, trapping pollutants. The surrounding terrain is a mosaic of agricultural lands – primarily coffee and dairy farming – interspersed with remnants of Atlantic Forest. While not directly adjacent to a major body of water, Itaguara is within the watershed of the Rio Pomba, a significant river in the region. The urban-rural gradient is relatively sharp, with the city centre transitioning quickly to agricultural areas. A key factor impacting air quality is the proximity to larger industrial centres in the state, particularly those involved in steel and mining, which can contribute to long-range transport of pollutants. The prevailing winds, often influenced by the topography, play a crucial role in dispersing or concentrating these emissions. The city’s growth, while modest with a population of 13,846, is increasingly linked to regional economic activity, potentially increasing vehicle emissions and localised industrial impacts.

Itaguara experiences a distinct wet and dry season, rather than traditional four seasons. Air quality generally improves during the wet season (October to April) due to increased rainfall which effectively washes particulate matter from the atmosphere. Higher humidity also suppresses dust. However, this period can see increased fungal spores, potentially impacting respiratory health. The dry season (May to September) consistently presents the poorest air quality. Reduced rainfall allows pollutants from agricultural activities – such as burning for land clearing – and regional industrial sources to accumulate. Temperature inversions are more frequent during the cooler, drier months, trapping pollutants near ground level. August and September are typically the months with the most noticeable air quality decline. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should limit strenuous outdoor activity during these periods. Monitoring wind patterns is crucial; winds from the south and southwest often carry pollutants from larger industrial areas. Fog, common during the cooler months, can exacerbate particulate matter concentrations. Proactive health measures, such as using air purifiers indoors and staying informed about local conditions, are recommended.