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Marmeleiro, nestled in the heart of Paraná state, Brazil, occupies a geographically significant position within the broader Southern Brazilian landscape. Located at approximately -26.1489° latitude and -53.0258° longitude, the city sits at an elevation of roughly 480 meters (1,575 feet) above sea level, contributing to a relatively mild climate. The surrounding terrain is characterized by undulating hills and valleys, typical of the Paraná Plateau, largely covered by agricultural land and scattered patches of Araucaria forest, a biome increasingly fragmented. Marmeleiro’s rural setting is a defining feature; it’s a predominantly agricultural municipality, with apple orchards being a particularly prominent feature of the local economy and landscape. This proximity to intensive agricultural practices, including pesticide use and fertilizer application, can influence local air quality. The urban character is that of a small, developing town, with a compact core and expanding residential areas. While not directly adjacent to major rivers, the city benefits from the presence of smaller streams and tributaries that contribute to the regional watershed. It lies some distance from major industrial belts, mitigating direct industrial pollution impacts. However, the urban–rural gradient is gradual, with agricultural activities impacting air quality even within the city limits. The prevailing winds, generally from the east, can transport pollutants from surrounding agricultural zones, and the topography can sometimes trap stagnant air, particularly during periods of atmospheric stability, influencing local air quality patterns.

Marmeleiro’s subtropical climate dictates a distinct seasonal narrative concerning air quality. The wet season, typically spanning from November to March, brings frequent rainfall, which naturally helps to cleanse the atmosphere by removing particulate matter and gaseous pollutants. Humidity levels are high during this period, which can sometimes exacerbate respiratory issues for sensitive individuals. The dry season, from April to October, presents a different set of challenges. Lower rainfall means less atmospheric cleansing, and the increased prevalence of sunshine can lead to photochemical smog formation, particularly during periods of stagnant air. Temperature inversions, common during the cooler months (June-August), trap pollutants near the ground, potentially leading to localized air quality degradation. Agricultural burning, a practice sometimes employed to clear land or manage crop residue, is most prevalent during the dry season, significantly contributing to particulate matter pollution. Wind patterns play a crucial role; calmer conditions during the dry season allow pollutants to accumulate, while stronger winds can disperse them. The apple harvest season (February-April) can also impact air quality due to dust generated from orchard activities. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during periods of agricultural burning and when temperature inversions are present, limiting outdoor exertion and monitoring for respiratory discomfort. The transition months (October and November) often offer the most favourable air quality conditions, with moderate temperatures and sufficient rainfall.