Eldorado Air Quality Index (AQI)

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Eldorado, nestled in the state of Mato Grosso do Sul, Brazil, occupies a significant position within the Pantanal biome, the world’s largest tropical wetland. Located at coordinates -23.7869, -54.2839, the city’s terrain is largely flat, characteristic of the Pantanal floodplain, with an elevation hovering around 80-100 meters above sea level. This low-lying geography profoundly influences air quality. The surrounding landscape is dominated by extensive grasslands, seasonally flooded savannas, and gallery forests along the numerous rivers and streams that crisscross the region. Eldorado’s proximity to the Paraná River basin contributes to high humidity levels. The city’s economy is heavily reliant on agriculture, particularly cattle ranching and soybean cultivation, creating a substantial rural-urban gradient. While not a heavily industrialized zone, agricultural practices – including the use of pesticides and controlled burns for land clearing – represent a key source of particulate matter and volatile organic compounds. The urban area itself is relatively small, with a population of approximately 11,386, meaning pollution sources are concentrated, and dispersion is limited, especially during periods of atmospheric stability. The Pantanal’s unique hydrological cycle and prevailing wind patterns play a crucial role in pollutant transport and dispersion, or lack thereof.

Eldorado experiences a distinct wet and dry season, rather than traditional four seasons. Air quality is generally better during the wet season (October to March) due to frequent rainfall which effectively washes particulate matter from the atmosphere. However, high humidity can also trap pollutants near the ground. The dry season (April to September) presents the greatest air quality challenges. This period coincides with increased agricultural activity, including burning for land preparation and harvesting, leading to significant spikes in smoke and particulate matter. August and September are typically the worst months for air quality, as the land is drier and burning is most prevalent. Temperature inversions, common during the cooler nights of the dry season, exacerbate the problem by trapping pollutants at ground level. Sensitive groups – children, the elderly, and individuals with respiratory conditions – should limit outdoor exertion during these months. The prevailing easterly winds can transport smoke from burning operations across the city, impacting air quality even in areas distant from the source. Monitoring wind direction is crucial for predicting pollution events. Fog, common during the transition periods, can also contribute to localized pollution build-up.