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Itaitinga, nestled in the state of Ceará, Brazil, occupies a strategically important position within the broader metropolitan region of Fortaleza. Located at approximately -3.9694° latitude and -38.5281° longitude, the city’s geography is characterized by a gently undulating terrain, transitioning from the coastal plains towards the interior highlands. Its elevation, averaging around 60 meters above sea level, contributes to a relatively mild climate, though susceptible to seasonal variations. The surrounding landscape is a mosaic of agricultural lands, primarily dedicated to sugarcane cultivation and fruit orchards, interspersed with patches of caatinga, the unique thorn forest biome of the Northeast. This agricultural activity, while vital to the local economy, can contribute to localized air pollution through the use of fertilizers and the burning of agricultural residues, particularly during harvest seasons. Itaitinga’s proximity to the São Francisco River, though not directly adjacent, influences regional humidity and weather patterns. The urban–rural gradient is relatively sharp, with the city acting as a service hub for the surrounding agricultural communities. The city’s location within the Serra da Baturité mountain range creates a funneling effect for winds, which can both disperse pollutants and, under certain meteorological conditions, trap them, leading to periods of stagnant air quality. The absence of large-scale industrial zones within Itaitinga itself mitigates some pollution risks, but the city’s role in the Fortaleza metropolitan area means it is indirectly affected by industrial emissions from that larger urban center.

Itaitinga’s tropical climate dictates a distinct wet and dry season pattern, significantly impacting air quality throughout the year. The dry season, typically spanning from August to November, is characterized by reduced rainfall and increased temperatures. This period often sees a rise in particulate matter as the lack of rain allows dust and agricultural emissions to accumulate. The caatinga vegetation, naturally adapted to drought, sheds leaves and releases pollen, further contributing to airborne particles. Temperature inversions, common during the cooler nights of the dry season, trap pollutants close to the ground, exacerbating the situation. Conversely, the wet season (December to July) brings frequent rainfall, which naturally cleanses the atmosphere, washing away particulate matter and reducing overall pollution levels. However, heavy rainfall can also lead to increased humidity and the release of volatile organic compounds (VOCs) from damp vegetation. The months of September and October, coinciding with the sugarcane harvest, are particularly concerning due to increased burning practices. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit outdoor activity during these periods and when visibility is reduced. During the wet season, while overall air quality improves, individuals with allergies may experience increased symptoms due to pollen and mold spores. Maintaining indoor air quality through proper ventilation and air filtration is advisable year-round, but especially during periods of elevated particulate matter.