Itariri Air Quality Index (AQI)

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Itariri, a municipality nestled within the state of São Paulo, Brazil, presents a unique geographic setting influencing its air quality. Located at coordinates -24.2888, -47.1332, the city occupies a relatively low-lying area within the coastal plains, approximately 15km inland from the Atlantic Ocean. The terrain is gently undulating, characterized by remnants of the Atlantic Forest and interspersed with agricultural land, primarily sugarcane and pasture. This proximity to the ocean introduces a consistent supply of humidity and moderating breezes, but also the potential for salt spray and marine aerosols. Itariri isn’t situated within a major industrial belt; however, the broader Baixada Santista region, of which it is a part, experiences industrial activity concentrated around port areas like Santos. The urban-rural gradient is quite pronounced, with the city centre representing a concentrated area of activity, while the periphery quickly transitions into agricultural landscapes. This pattern affects air quality as emissions from vehicle traffic and small-scale businesses are localized, while agricultural practices contribute to particulate matter from land preparation and potential burning. The prevailing winds, generally from the southeast, carry pollutants inland, potentially impacting Itariri. The city’s elevation, averaging around 30 meters above sea level, contributes to limited atmospheric dispersion.

Itariri experiences a tropical climate, defined by distinct wet and dry seasons rather than traditional four seasons. Air quality in Itariri is most compromised during the dry season, typically from April to September. Reduced rainfall leads to increased dust and particulate matter from unpaved roads and agricultural activities. Lower humidity also inhibits the settling of pollutants. Temperature inversions, common during calm, clear nights in the dry season, trap pollutants near the ground, exacerbating air quality issues. The wet season, from October to March, generally brings improved air quality due to rainfall washing away pollutants and higher humidity suppressing dust. However, intense rainfall events can lead to localized flooding and the mobilization of sediment, temporarily increasing particulate matter. November and December often see increased agricultural burning as farmers prepare for planting, creating spikes in smoke and particulate pollution. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during the dry season, particularly in the late afternoon and early evening. During the wet season, monitoring for localized pollution from flooding is advisable. Fog, common in the mornings, can trap pollutants, though its impact is usually less severe than temperature inversions.