Alterosa Air Quality Index (AQI)

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Alterosa, nestled in the heart of Minas Gerais, Brazil, occupies a unique geographic position at coordinates -21.2489, -46.1428. The city’s terrain is characterised by rolling hills and valleys, typical of the Brazilian Highlands, with an elevation that contributes to localized weather patterns. Situated approximately 250km north of Belo Horizonte, Alterosa is not directly adjacent to major industrial belts, but benefits from, and is potentially impacted by, the agricultural activity prevalent throughout Minas Gerais, particularly coffee and dairy farming. The surrounding landscape is predominantly rural, transitioning to more densely populated areas closer to larger regional centres. This urban-rural gradient influences air quality, as agricultural practices can contribute to particulate matter from land preparation and biomass burning, while the smaller urban footprint of Alterosa itself limits concentrated industrial emissions. The lack of significant bodies of water immediately adjacent to the city means that evaporative cooling is less pronounced, potentially exacerbating temperature inversions. The city’s relatively small population of 13,915 means emissions are lower than larger metropolitan areas, but dispersion is also reduced by the hilly topography. Understanding these geographical factors is crucial for assessing and mitigating air pollution risks in Alterosa.

Alterosa experiences a distinct wet and dry season, rather than traditional four seasons. Air quality in Alterosa is most compromised during the dry season, typically from May to September. This period sees reduced rainfall, leading to increased dust and particulate matter suspension from unpaved roads and agricultural lands. Lower humidity also inhibits the natural scavenging of pollutants from the atmosphere. Temperature inversions, common during cooler nights in the dry season, trap pollutants near ground level, worsening air quality. Conversely, the wet season (October to April) brings significant improvements. Rainfall effectively washes pollutants from the air, and higher humidity promotes their deposition. However, increased agricultural activity during planting and harvesting can temporarily elevate particulate matter levels, even during the wet season. November and December often see a brief resurgence of dust due to land preparation. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during the drier months, particularly in the late afternoon and early morning. Monitoring local weather patterns and avoiding areas near agricultural burning are also advisable. The transition months of October and April offer the most favourable conditions for outdoor activities.