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Fortim, a coastal municipality in the state of Ceará, Brazil, occupies a geographically significant position along the country’s northeastern Atlantic shoreline. Located at approximately -4.4500 latitude and -37.7833 longitude, the city’s terrain is predominantly flat, typical of the coastal plains of Ceará. The elevation is minimal, contributing to limited natural dispersion of pollutants. Fortim benefits from direct access to the Atlantic Ocean, which usually provides a moderating influence on temperatures and can assist in dispersing airborne particles, but also introduces sea salt aerosols. The surrounding landscape is a mix of beaches, dunes, and areas transitioning into the *sertão*, the arid interior of the Northeast. While Fortim itself is not heavily industrialized, its proximity to larger urban centers like Mossoró and Natal, and the increasing development of tourism infrastructure, introduces potential sources of air pollution. Agricultural activity, particularly cashew and coconut cultivation, is prevalent in the region, with associated seasonal burning potentially impacting local air quality. The urban-rural gradient is relatively sharp, with the city center concentrated along the coast and quickly giving way to less populated, more natural areas inland. This coastal location makes Fortim particularly vulnerable to long-range transport of pollutants from other regions and even across the Atlantic.

Fortim experiences a distinct wet and dry season, rather than traditional four seasons. Air quality in Fortim is most compromised during the dry season, typically from August to December. This period sees reduced rainfall, leading to dust resuspension from the arid interior and decreased atmospheric cleansing. The *Alizés*, the trade winds, can carry Saharan dust across the Atlantic, significantly impacting particulate matter levels. Lower humidity also exacerbates the effects of any local burning, whether agricultural or related to waste disposal. Temperature inversions, common during the calmer nights of the dry season, trap pollutants near the ground. The wet season, from January to July, generally brings improved air quality due to rainfall washing away pollutants and increased humidity suppressing dust. However, even during the wet season, localized pollution from vehicle emissions and construction can be a concern. February and March, with moderate rainfall and consistent breezes, are generally the most favourable months for outdoor activity. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor exertion during the peak of the dry season and monitor local conditions closely. Fog, common in the mornings, can trap pollutants, requiring caution.