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Forquilha, nestled in the state of Ceará, Brazil, occupies a unique geographic position within the broader semi-arid landscape of the Northeast. Located at coordinates -3.7978, -40.2608, the city sits approximately 180km from the Atlantic coast, influencing its climate but not directly benefiting from coastal breezes in terms of pollution dispersal. The terrain is characterized by gently rolling hills and *chapadas* (plateaus), typical of the Borborema Plateau, with an elevation ranging between 150-250 meters. This inland location contributes to a reduced flushing effect for airborne pollutants. Forquilha’s urban character is that of a small, developing city, with a population of 24,173, primarily centered around agricultural activities – particularly cashew and fruit cultivation – and small-scale commerce. The surrounding landscape is dominated by *caatinga* vegetation, a thorny scrubland adapted to drought conditions. While not heavily industrialized, regional agricultural practices, including seasonal burning for land preparation, contribute to particulate matter. The urban-rural gradient is relatively sharp, with agricultural lands immediately bordering the city limits. The lack of significant natural barriers to air flow, combined with the dry climate, means pollutants can accumulate locally, particularly during periods of low wind speed. This geographical setting dictates the specific challenges Forquilha faces regarding air quality management.

Forquilha experiences a distinct wet and dry season, rather than traditional four seasons. Air quality is generally better during the wet season (roughly August to December) due to rainfall scavenging pollutants from the atmosphere and suppressing dust. However, increased humidity can also promote the formation of mold spores, potentially impacting respiratory health. The dry season (January to July) presents the greatest air quality challenges. From February to May, the *caatinga* vegetation is particularly dry, and agricultural burning for cashew harvesting and land clearing is common, leading to significant spikes in particulate matter (PM2.5 and PM10). Strong winds, often associated with the trade winds, can exacerbate dust storms, transporting particles from the surrounding arid lands into the city. June and July often experience temperature inversions, trapping pollutants near the ground. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during these months. November and December, with the onset of rains, offer the most favourable conditions for outdoor pursuits. Monitoring wind direction is crucial; winds from the west and north often carry agricultural smoke into Forquilha. Local meteorological patterns heavily influence pollutant concentration and dispersion.