São João Air Quality Index (AQI)

Loading live AQI data...

Loading historical AQI trends...

São João, Paraná, nestled within the Brazilian state known for its agricultural prowess, occupies a geographically significant position in the Paraná River basin. Located at approximately -25.8278° latitude and -52.7250° longitude, the city’s terrain is characterized by gently undulating hills, typical of the Paraná Plateau. Its elevation, while modest, contributes to localized microclimates that can influence air circulation patterns. The surrounding landscape is predominantly rural, dominated by extensive agricultural lands – soy, corn, and sugarcane are common crops – and interspersed with pastureland for cattle ranching. This proximity to intensive agricultural activity is a key factor in São João’s air quality profile, with potential for particulate matter from field burning practices, particularly during harvest seasons. The Paraná River, though not directly adjacent, exerts a regional influence on humidity and precipitation patterns. The urban–rural gradient transitions relatively quickly, with the city itself exhibiting a compact, traditional layout. While São João isn't situated within a major industrial belt, it serves as a regional service center for the surrounding agricultural communities, leading to vehicular traffic and localized emissions. The prevailing winds generally flow from the west, carrying potential pollutants from agricultural areas eastward. Topography creates some sheltering effects, but also can trap pollutants under certain meteorological conditions, impacting air quality within the city limits. The climate is humid subtropical, further influencing the dispersion of airborne contaminants.

São João’s air quality experiences a distinct seasonal rhythm dictated by its humid subtropical climate and the region’s agricultural practices. 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, periods of prolonged fog, common during this season, can trap pollutants near the ground, creating localized episodes of reduced visibility and potentially elevated concentrations of certain contaminants. The dry season, from April to September, presents a more complex picture. Agricultural burning, a common practice for land clearing and crop residue disposal, intensifies during this period, particularly in September and October, significantly increasing particulate matter levels. Temperature inversions, where a layer of warm air sits above cooler air near the ground, are also more frequent during the dry season, hindering vertical mixing and trapping pollutants. The months of September and October are generally the most challenging for air quality, requiring heightened awareness and precautions. During the summer months (December-February), high temperatures and humidity can exacerbate respiratory issues. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should limit prolonged outdoor activity during periods of agricultural burning and fog. Maintaining indoor air quality through proper ventilation and air filtration is also advisable throughout the year, but especially during peak pollution periods. The transition months (April/May and September/October) often see fluctuating air quality as weather patterns shift.