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Pitanga, Paraná, nestled within the Serra do Mar mountain range in southern Brazil, presents a unique geographic profile significantly influencing its air quality. Located at approximately -24.76° S, -51.76° W, the city sits at an elevation of around 580 meters (1,904 feet) above sea level, contributing to a cooler climate compared to lower-lying regions of Paraná. The surrounding landscape is dominated by the lush Atlantic Forest biome, a biodiversity hotspot, but also a source of biomass burning during drier periods. Pitanga’s position within the broader Curitiba metropolitan area, though not directly adjacent, places it within the sphere of influence of regional industrial and agricultural activities. To the west, agricultural zones dedicated to soy and maize cultivation are prevalent, potentially contributing to particulate matter through tilling and pesticide application. To the east, the Serra do Mar acts as a barrier, influencing wind patterns and trapping pollutants under certain meteorological conditions. The urban–rural gradient around Pitanga is relatively gradual, with smaller agricultural settlements and forested areas interspersed throughout the municipality. The city itself exhibits a moderate urban character, with a mix of residential areas, commercial zones, and some light industrial activity. The proximity to the Rio Turvo, a tributary of the larger Ribeira de Iguape river, provides a local water source but also influences humidity levels, which can affect pollutant dispersion. Topography plays a crucial role; valleys can experience stagnant air and increased pollutant concentrations, while higher elevations generally benefit from better ventilation.

Pitanga’s subtropical climate dictates a distinct seasonal pattern in air quality. The wet season, typically spanning from October to March, brings frequent rainfall and higher humidity, generally leading to improved air quality as precipitation washes away particulate matter and dilutes gaseous pollutants. However, the preceding dry season (April to September) presents a greater challenge. During this period, reduced rainfall and increased temperatures create conditions conducive to biomass burning, primarily from agricultural practices and controlled burns in the surrounding Atlantic Forest. This results in elevated levels of particulate matter, particularly PM2.5 and PM10, which can penetrate deep into the lungs. Temperature inversions, common during the cooler months (June-August), trap pollutants near the ground, exacerbating the problem. Fog, also more frequent during these months, further reduces atmospheric mixing and concentrates pollutants. The months of August and September often experience the poorest air quality due to a combination of these factors. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit outdoor activity during these periods, especially during the early morning hours when inversions are most prevalent. During the wet season, while overall air quality is better, periods of heavy rainfall can still lead to localized flooding and the release of mold spores, impacting indoor air quality. Maintaining indoor air quality through proper ventilation and air purification is crucial throughout the year, but particularly during the dry season’s peak pollution periods.