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Bom Jardim, nestled in the state of Pernambuco, Brazil, occupies a unique geographic position within the Agreste region, a transitional zone between the coastal *mata* forests and the arid *sertão*. Located at coordinates -7.7958, -35.5869, the city sits at an elevation of approximately 230 meters (755 feet) above sea level, contributing to a moderate climate influenced by both coastal humidity and inland dryness. The surrounding landscape is characterised by rolling hills and valleys, typical of the Brazilian Northeast, with a significant portion of land dedicated to agriculture, primarily sugarcane and fruit cultivation. Bom Jardim isn’t directly adjacent to the coast, but receives some influence from Atlantic moisture. The urban character is largely rural, with a relatively low population density of 37,629, indicating a strong urban-rural gradient. This agricultural activity, while economically vital, presents a potential source of particulate matter from land preparation and harvesting. The lack of heavy industry within the immediate vicinity is a positive factor, but regional transport routes and seasonal burning practices in surrounding areas can contribute to episodic air quality concerns. The topography, with its undulating terrain, can also influence local wind patterns and pollutant dispersion, creating pockets of stagnation.

Bom Jardim experiences a distinct wet and dry season, rather than traditional four seasons. The wet season, typically running from March to August, brings increased rainfall and higher humidity. While rainfall helps to suppress dust and particulate matter, the increased moisture can also foster mold growth, impacting indoor air quality. The dry season, from September to February, is characterised by lower humidity and increased wind speeds. This period often sees a rise in airborne dust and particulate matter, particularly from agricultural activities like sugarcane harvesting and burning, a common practice for land clearing. November and December are often the months with the poorest air quality due to these factors. Temperature inversions, where a layer of warm air traps cooler air near the surface, can exacerbate pollution during calm mornings in the dry season. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit strenuous outdoor activity during these periods. The prevailing easterly winds can transport pollutants from coastal areas, while westerly winds can bring dust from the *sertão*. Monitoring wind direction is crucial for understanding pollution sources. Generally, the wet season offers better air quality for outdoor activities.