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São José da Coroa Grande, nestled along the northeastern coast of Brazil in the state of Pernambuco, presents a unique geographic setting influencing its air quality. Situated at -8.8978 latitude and -35.1478 longitude, the city’s terrain is largely flat, characteristic of the coastal plains known as the Zona da Mata. This low elevation, averaging around 25 meters above sea level, contributes to limited atmospheric dispersion of pollutants. The city directly borders the Atlantic Ocean, experiencing the moderating influence of sea breezes, but also vulnerability to marine aerosols. Surrounding the urban core is a mosaic of sugarcane plantations, a dominant feature of Pernambuco’s agricultural landscape, and patches of remnant Atlantic Forest. While not a major industrial hub itself, São José da Coroa Grande is within reach of larger industrial zones further inland, potentially receiving transported pollutants. The urban-rural gradient is relatively sharp, with the city centre densely populated and transitioning quickly to agricultural land. This proximity to agriculture introduces potential sources of particulate matter from field burning and fertilizer application. The coastal location also means salt spray is a constant atmospheric component, impacting corrosion and potentially influencing aerosol formation. Understanding these geographical factors is crucial for assessing and mitigating air pollution in São José da Coroa Grande.

São José da Coroa Grande experiences a distinct wet and dry season, heavily influencing air quality. The dry season, typically from August to December, sees significantly reduced rainfall and increased dust resuspension from agricultural lands, leading to higher particulate matter concentrations. Lower humidity also inhibits the scavenging of pollutants by precipitation. This period is often characterized by stable atmospheric conditions and weaker sea breezes, hindering pollutant dispersion. January to July marks the wet season, bringing relief from dust and a natural cleansing effect through rainfall. However, even during the wet season, localized pollution can occur. The intense rainfall can also lead to increased humidity and the potential for mold growth, impacting indoor air quality. February and March often experience higher humidity and occasional periods of calmer winds, potentially trapping pollutants near the coast. Sensitive individuals, such as those with respiratory conditions, should be particularly cautious during the dry season. Monitoring wind patterns is crucial; easterly winds can transport pollutants from inland agricultural activities. Avoiding strenuous outdoor activity during peak dry season hours and ensuring good ventilation indoors are recommended health precautions. The consistent sea breeze offers some dilution, but localized sources can still create problematic conditions.