Jacarèzinho Air Quality Index (AQI)

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Jacarezinho, nestled in the north-central region of Paraná state, Brazil, occupies a unique geographic position within the rolling landscapes of the Second Paraná Plateau. Located at coordinates -23.1606, -49.9694, the city sits at an elevation of approximately 420 meters, influencing local air circulation patterns. The terrain is characterized by gently undulating hills and valleys, typical of the plateau’s eroded basaltic structure. The Ribeira do Ivaí river flows nearby, providing a crucial water source but also potentially contributing to humidity and localized temperature inversions that can trap pollutants. Surrounding Jacarezinho is a predominantly agricultural zone, heavily focused on soybean, corn, and sugarcane cultivation. This agricultural activity is a significant factor in air quality, with seasonal burning of crop residue being a major source of particulate matter. The urban-rural gradient is relatively sharp, with the city centre transitioning quickly to expansive farmland. While Jacarezinho isn’t a major industrial hub, smaller agro-industries processing agricultural products are present, adding to potential emission sources. The city’s location, shielded by higher terrain to the south and west, can limit wind dispersal of pollutants, particularly during stable atmospheric conditions. Understanding these geographical factors is crucial for assessing and mitigating air quality challenges in Jacarezinho.

Jacarezinho experiences a humid subtropical climate, with distinct wet and dry seasons influencing air quality. The dry season, typically from May to September, sees a marked increase in particulate matter due to agricultural burning preparing fields for planting. Lower humidity and stable atmospheric conditions during these months exacerbate pollution, creating periods of reduced visibility and respiratory irritation. August and September are often the most challenging months for those with pre-existing respiratory conditions. Conversely, the wet season, from October to April, generally brings improved air quality. Rainfall effectively washes away pollutants, and higher humidity reduces dust suspension. However, the wet season can also lead to increased fungal spore concentrations, impacting allergy sufferers. November and December, with their frequent rainfall, are typically the most favourable months for outdoor activity. Temperature inversions, common during cooler nights throughout the year, can trap pollutants near ground level, particularly in the city centre. Strong southerly winds, occasionally experienced during frontal passages, can provide temporary relief by dispersing pollutants. Sensitive groups – children, the elderly, and individuals with respiratory illnesses – should limit strenuous outdoor activity during dry season peak pollution periods.