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Chaval, a municipality nestled within the state of Ceará in northeastern Brazil, presents a unique geographic context influencing its air quality. Located at -3.0339 latitude and -41.2439 longitude, the city sits relatively close to the Atlantic coastline, approximately 60 kilometers inland. The terrain is predominantly flat to gently undulating, characteristic of the broader Ceará landscape, which transitions from coastal plains to the sertão, a semi-arid interior. This proximity to the coast introduces the potential for saline aerosols impacting air composition, while the surrounding landscape is largely dominated by caatinga vegetation – a thorny scrubland adapted to drought conditions. Chaval’s urban character is that of a small, developing town, with a population of around 12,462. The surrounding region is primarily agricultural, focused on subsistence farming and livestock raising, with limited heavy industry. However, increasing agricultural activity, including the use of pesticides and controlled burns for land clearing, can contribute to particulate matter and gaseous pollutants. The urban-rural gradient is relatively sharp, with a noticeable shift in air quality as one moves away from the concentrated human activity within the town itself. Dust from unpaved roads and agricultural lands is a significant factor, particularly during the dry season. The low elevation further concentrates pollutants, limiting atmospheric dispersion.

Chaval experiences a distinct wet and dry season, heavily influencing its air quality. The dry season, typically from August to December, is characterized by intense heat and minimal rainfall. This period sees a significant increase in airborne dust and particulate matter, exacerbated by agricultural activities like harvesting and land preparation. Controlled burns, used to clear land for the next planting season, contribute substantially to smoke and PM2.5 levels, posing risks to respiratory health. January to April marks the wet season, bringing relief from the dust and smoke. Rainfall effectively washes pollutants from the atmosphere, leading to improved air quality. However, high humidity can also foster mold growth, impacting indoor air quality. May to July represents a transitional period with variable conditions. Temperature inversions, common during calmer nights, can trap pollutants near the ground, particularly in the early morning. Sensitive individuals – children, the elderly, and those with pre-existing respiratory conditions – should limit strenuous outdoor activity during the dry season, especially when agricultural burning is prevalent. Monitoring wind patterns is crucial; easterly winds can carry pollutants from more industrialized areas further inland. The wet season generally offers the most favourable conditions for outdoor activities, but vigilance regarding mold and humidity is advised.