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Caraúbas, nestled in the Rio Grande do Norte state of Brazil, occupies a geographically significant position within the Agreste region, a transitional zone between the humid coastal forests and the semi-arid interior. Located at approximately -5.7928° latitude and -37.5569° longitude, the city’s terrain is characterized by undulating hills and valleys, typical of the region's weathered sandstone plateaus. The elevation ranges from roughly 30 to 150 meters above sea level, influencing local wind patterns and temperature distribution. Caraúbas benefits from proximity to the Rio Piranhas, a vital waterway that contributes to the region’s limited water resources and supports some agricultural activity. The surrounding landscape is a mosaic of small-scale agriculture – primarily cassava, beans, and maize – interspersed with patches of caatinga vegetation, a drought-resistant thorn forest characteristic of the Northeast Brazilian interior. The urban–rural gradient is relatively sharp; Caraúbas itself is a modest-sized municipality, and the transition to rural agricultural lands is quite immediate. While not directly adjacent to major industrial belts, the city’s location within a region experiencing increasing agricultural intensification raises concerns about pesticide drift and fertilizer runoff impacting local air quality. The prevailing winds, generally from the northeast, can transport pollutants from agricultural areas or distant industrial zones, although the relatively sparse population density mitigates some of these effects. The city’s climate, classified as semi-arid, contributes to a drier atmosphere, which can sometimes exacerbate particulate matter concentrations.

Caraúbas experiences a distinct wet and dry season pattern, profoundly influencing its air quality dynamics. The dry season, typically spanning from August to November, is characterized by minimal rainfall, high temperatures, and a significant increase in atmospheric stability. This often leads to temperature inversions, where a layer of warm air traps cooler air near the ground, preventing the vertical dispersion of pollutants. Agricultural burning, a common practice for land clearing and crop residue removal, intensifies during this period, releasing substantial amounts of particulate matter and gases into the atmosphere. Consequently, the dry season presents the most challenging period for air quality in Caraúbas. The wet season, from March to July, brings increased rainfall and higher humidity, which naturally scavenges pollutants from the air, leading to improved air quality. Stronger winds associated with occasional thunderstorms also aid in dispersing pollutants. However, heavy rainfall can also lead to increased dust resuspension from unpaved roads and agricultural fields, temporarily degrading air quality. The months of September and October are particularly concerning due to the combination of dry conditions, agricultural burning, and temperature inversions. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit outdoor activities during these periods. During the wet season, while generally better, periods of fog can still trap pollutants, so caution is advised, especially early in the morning. Maintaining green spaces within the city and promoting sustainable agricultural practices are crucial for mitigating air quality issues throughout the year.