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Boa Viagem, Ceará, nestled in northeastern Brazil, presents a unique geographic context influencing its air quality. Located at -5.1278 latitude and -39.7319 longitude, the city sits approximately 80km from the state capital, Fortaleza. The terrain is largely flat, characteristic of the coastal plains of Ceará, with an elevation generally below 50 meters. This flatness contributes to limited natural dispersion of pollutants. The city’s proximity to the Atlantic Ocean, roughly 5km east, introduces a constant supply of sea breeze, which can both dilute and transport pollutants. However, this effect is variable depending on prevailing wind directions. Surrounding Boa Viagem is a mosaic of agricultural land, primarily focused on cashew and coconut cultivation, and increasingly, small-scale industrial activity related to food processing and light manufacturing. The urban-rural gradient is relatively sharp, with rapid development occurring along the BR-020 highway. Dust from agricultural practices and construction, combined with vehicle emissions from the highway, are significant local sources. The lack of substantial hills or valleys hinders natural ventilation, making the city susceptible to pollutant build-up, particularly during periods of calm weather. Understanding this interplay of coastal influences, flat terrain, and surrounding land use is crucial for addressing air quality concerns.

Boa Viagem experiences a distinct wet and dry season, heavily influencing air quality. The dry season, from August to December, is characterized by hot temperatures and reduced rainfall. This period sees a peak in particulate matter (PM) concentrations due to increased dust resuspension from agricultural lands and construction activities, exacerbated by drier conditions and stronger winds. November and December are typically the months with the poorest air quality. Conversely, the wet season, spanning January to July, brings relief. Rainfall effectively washes away airborne particles, leading to improved air quality. However, high humidity can also promote the formation of mold and other biological pollutants. February and March generally offer the most favourable conditions for outdoor activity. Temperature inversions, common during the transition periods between wet and dry seasons, can trap pollutants near the ground, worsening air quality even with rainfall. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit strenuous outdoor activity during the dry season and periods of inversion. Monitoring wind patterns is vital; easterly winds tend to bring cleaner air from the ocean, while westerly winds can carry pollutants from inland sources.