Taquarana Air Quality Index (AQI)

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Taquarana, nestled in the state of Alagoas, Brazil, occupies a geographically significant position within the Northeast region. Located at approximately -9.6450 latitude and -36.4969 longitude, the city’s terrain is characterized by undulating hills and valleys, typical of the Serra da Barrinha, a low mountain range that influences local microclimates. The surrounding landscape is predominantly a mosaic of *cerrado* (Brazilian savanna) and *caatinga* (thorn forest) vegetation, interspersed with agricultural lands. This proximity to extensive agricultural zones, particularly sugarcane and maize cultivation, introduces potential sources of particulate matter and volatile organic compounds (VOCs) into the air, especially during harvest seasons. Taquarana sits relatively far from major industrial belts, mitigating large-scale industrial pollution; however, smaller-scale agricultural processing facilities and local businesses contribute to localized emissions. The city’s elevation, averaging around 450 meters above sea level, can influence air circulation patterns, sometimes leading to stagnant air conditions, particularly during periods of low wind speed. The Rio Taquarana, a modest river flowing through the municipality, offers some degree of humidity, which can affect the dispersion of pollutants. The urban–rural gradient is relatively sharp, with the city transitioning quickly into agricultural and natural landscapes, meaning that rural activities have a more direct impact on the city’s air quality than in more densely urbanized areas. The climate is tropical, with distinct wet and dry seasons, further impacting atmospheric conditions and pollutant behaviour.

Taquarana’s tropical climate dictates a distinct wet and dry seasonal cycle, profoundly influencing air quality. The dry season, typically spanning from August to December, is often characterized by lower rainfall and higher temperatures. This period frequently sees a build-up of particulate matter, primarily from agricultural activities like sugarcane burning, a common practice for land clearing and preparation. Reduced rainfall means less atmospheric cleansing, and the drier air can exacerbate the effects of dust and smoke. Temperature inversions, where cooler air is trapped beneath a layer of warmer air, are more likely to occur during the dry season, hindering vertical mixing and concentrating pollutants near ground level. Conversely, the wet season (January to July) brings increased rainfall and higher humidity, naturally washing away particulate matter and diluting gaseous pollutants. Stronger winds associated with the monsoon-like rains also aid in dispersing pollutants. Fog, though infrequent, can occasionally form during cooler nights, trapping pollutants and temporarily reducing visibility. Outdoor activities are generally more favourable during the wet season, particularly in the months of March to May, when rainfall is moderate and temperatures are relatively mild. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, limiting prolonged outdoor exposure and avoiding areas with visible smoke. Agricultural workers are particularly vulnerable and should utilize appropriate respiratory protection during burning activities. Public health advisories are crucial during periods of elevated particulate matter, emphasizing preventative measures and promoting awareness of air quality conditions.