Jiquiriçá Air Quality Index (AQI)

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Jiquiriçá, nestled in the southern reaches of Bahia, Brazil, occupies a geographically significant position within the Chapada Diamantina region. Located at approximately -13.2569° latitude and -39.5719° longitude, the city’s terrain is characterized by undulating hills and valleys, a typical feature of the Brazilian Highlands. Its elevation, averaging around 750 meters above sea level, contributes to a relatively cool climate compared to coastal areas of Bahia, a factor influencing local atmospheric conditions. The surrounding landscape is a mosaic of cerrado vegetation – a savanna-like biome – interspersed with agricultural lands primarily dedicated to coffee and sugarcane cultivation. This agricultural activity, while vital to the local economy, introduces potential sources of particulate matter and volatile organic compounds into the air. Jiquiriçá sits within a transitional zone, exhibiting a gradual urban–rural gradient. While the city itself is relatively small with a population of 13,629, it serves as a regional hub for surrounding rural communities. The Rio de Contas, a significant river, flows nearby, influencing local humidity and potentially impacting the dispersion of pollutants. The absence of major industrial belts directly adjacent to Jiquiriçá mitigates some pollution risks, but agricultural burning practices during land clearing and sugarcane harvesting periods can significantly impact air quality, particularly during the drier months. The city’s location within a highland region also means that temperature inversions are possible, trapping pollutants closer to the ground.

Jiquiriçá’s tropical climate dictates a distinct wet and dry season pattern, profoundly influencing its air quality. The dry season, typically spanning from April to September, is characterized by lower rainfall and increased temperatures, often accompanied by periods of intense sunshine. This period frequently sees a rise in particulate matter concentrations due to agricultural burning practices. Farmers often utilize controlled burns to clear land for planting or to manage sugarcane fields, releasing significant amounts of smoke and ash into the atmosphere. Wind patterns during this time can be variable; periods of calm can lead to pollutant accumulation, while stronger winds can disperse them, though often carrying them to neighboring communities. The wet season, from October to March, brings increased rainfall and higher humidity, naturally cleansing the air and reducing particulate concentrations. However, heavy rainfall can also lead to increased levels of mold and fungal spores, impacting air quality for individuals with respiratory sensitivities. Fog, though infrequent, can occur during cooler nights, trapping pollutants near the ground. During the transition months (March/April and September/October), air quality is generally more moderate. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during the dry season, particularly during periods of agricultural burning. Limiting outdoor exertion and wearing masks can help mitigate exposure. The increased humidity during the wet season may exacerbate allergies for some individuals.