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Pacatuba, nestled in the state of Ceará, Brazil, occupies a geographically significant position within the larger Fortaleza metropolitan region. Located approximately 30 kilometers southwest of Fortaleza, its coordinates (-3.9839, -38.6200) place it within a transitional zone between the urban sprawl of the capital and the expansive Sertão interior. The city’s terrain is characterized by gently undulating hills and valleys, a landscape sculpted by the interplay of ancient geological processes and the region’s semi-arid climate. Pacatuba sits near the banks of the Pacatuba River, a vital water source and a defining feature of the local environment, though its flow can fluctuate dramatically with seasonal rainfall. The surrounding landscape is a mosaic of small-scale agriculture, primarily focused on fruit orchards (particularly mangoes and bananas) and livestock grazing, gradually giving way to the drier, more sparsely vegetated Sertão further inland. This agricultural activity, while contributing to the local economy, can introduce localized sources of air pollution, particularly during harvest seasons. The urban–rural gradient is relatively sharp, with the city’s periphery blending seamlessly into agricultural lands and scattered rural settlements. The proximity to Fortaleza, a major industrial and commercial hub, means that Pacatuba is susceptible to the advection of pollutants from the larger metropolitan area, especially during periods of stagnant air. Elevation plays a minor role, with the city situated at a relatively low altitude, generally below 100 meters, which can exacerbate temperature inversions and trap pollutants near the ground.

Pacatuba’s tropical climate dictates a distinct wet and dry season pattern, profoundly influencing its air quality. The dry season, typically spanning from July to November, is characterized by consistently high temperatures, low humidity, and a marked decrease in rainfall. This period often sees a build-up of particulate matter due to reduced precipitation to wash pollutants from the atmosphere and increased dust from agricultural activities and unpaved roads. Stagnant air conditions are more frequent during the dry season, hindering pollutant dispersion and leading to localized air quality challenges. Conversely, the wet season, from February to June, brings frequent rainfall and higher humidity, naturally cleansing the air and reducing particulate concentrations. However, intense rainfall events can occasionally lead to increased levels of biological allergens and mold spores. The interplay of temperature and wind is crucial; periods of calm winds combined with high temperatures during the dry season create conditions ripe for temperature inversions, trapping pollutants closer to the ground. During the wet season, the monsoon-like rains generally improve air quality, though fog, particularly in the early morning hours, can temporarily reduce visibility and trap pollutants. Sensitive groups, such as children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, limiting strenuous outdoor activities during peak heat and periods of stagnant air. The transition months (December-January and June-February) often present a mix of conditions, requiring vigilance and awareness of local weather patterns.