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Marialva, nestled in the state of Paraná, Brazil, occupies a gently undulating terrain within the larger Paraná Plateau. Located at coordinates -23.4850, -51.7919, the city’s elevation is approximately 550 meters above sea level, influencing local meteorological patterns. The surrounding landscape is predominantly agricultural, characterized by extensive soybean, corn, and wheat cultivation, typical of Paraná’s fertile lands. This agricultural dominance is a key factor in understanding Marialva’s air quality, as agricultural practices contribute to particulate matter through soil disturbance and the use of fertilizers and pesticides. The city is not directly adjacent to major bodies of water, though the Paranapanema River lies approximately 50km to the south, offering limited influence on local humidity. While Marialva isn’t a major industrial hub, the presence of agro-industries processing agricultural products contributes to localised emissions. The urban-rural gradient is relatively sharp, with agricultural land immediately bordering the city limits. This proximity means that air quality within Marialva is heavily influenced by regional agricultural activities and prevailing wind directions, which often carry pollutants from surrounding fields. The city’s position within a plateau region can also contribute to temperature inversions, trapping pollutants near the ground.

Marialva experiences a humid subtropical climate, with distinct wet and dry seasons rather than traditional four seasons. Air quality generally deteriorates during the dry season (roughly May to September). This is due to reduced rainfall, which limits the natural cleansing of the atmosphere, and increased dust from agricultural activities as fields are prepared for planting and harvesting. The drier air also allows for greater dispersion of smoke from agricultural burning, a common practice in the region. August and September are typically the months with the poorest air quality. Conversely, the wet season (October to April) brings improved air quality as rainfall washes away pollutants and increases humidity, suppressing dust. However, even during the wet season, periods of stagnant air can lead to localised pollution build-up. Temperature inversions, common during cooler nights, can exacerbate pollution events year-round. Sensitive groups – children, the elderly, and individuals with respiratory conditions – should limit strenuous outdoor activity during dry periods and be mindful of smoke haze. Monitoring wind direction is crucial; winds from agricultural areas will likely carry higher pollutant loads. The transition months of April and October often experience fluctuating conditions, requiring increased vigilance.