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Extremoz, a coastal municipality in the state of Rio Grande do Norte, Brazil, presents a unique geographic setting influencing its air quality. Situated at -5.7058 latitude and -35.3069 longitude, the city lies on a relatively flat coastal plain, gently sloping towards the Atlantic Ocean. Its elevation is low, averaging around 20 meters above sea level, making it susceptible to marine influences and humidity. The surrounding landscape is characterized by a mix of sandy beaches, dunes, and areas of *restinga* – a coastal vegetation unique to Brazil. While Extremoz itself is not heavily industrialized, its proximity to the larger metropolitan area of Natal, approximately 25 kilometers south, introduces potential for regional pollution transport. Agriculture, particularly fruit cultivation (mangoes, coconuts) and small-scale farming, dominates the rural areas surrounding the urban core. The urban-rural gradient is relatively sharp, with a concentration of population and activity along the coastal highway. This coastal location means prevailing trade winds play a crucial role in dispersing pollutants, but can also trap them during periods of calm. The lack of significant topographical features to break wind patterns means pollutants can readily travel both inland and out to sea, impacting local air quality and potentially contributing to regional haze.

Extremoz experiences a tropical climate with a distinct wet and dry season, heavily influencing air quality. The wet season, typically from March to August, brings increased rainfall and higher humidity. While rainfall helps to scrub the air of particulate matter, the increased moisture can also foster mold growth, impacting respiratory health. Winds are generally stronger during this period, aiding in pollutant dispersion, though localized flooding can stir up dust and debris. The dry season, from September to February, presents the most challenging air quality conditions. Reduced rainfall allows pollutants to accumulate, and lower humidity can exacerbate respiratory issues. Calm wind conditions are more frequent, leading to temperature inversions where cooler air traps pollutants near the surface. December and January, coinciding with peak tourist season and agricultural burning for land preparation, often see the poorest air quality. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit strenuous outdoor activity during these months. Monitoring wind direction is crucial; winds from the south can carry pollutants from Natal, while those from inland may bring agricultural smoke. Overall, the wet season offers better air quality, but vigilance regarding mold and humidity is still necessary.