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Canto do Buriti, nestled in the state of Piauí, Brazil, occupies a unique position within the semi-arid Caatinga biome. Located at -8.1100 latitude and -42.9439 longitude, the city sits on relatively flat terrain, typical of the Parnaíba River basin. The surrounding landscape is characterised by thorny scrubland, cacti, and scattered deciduous forests, reflecting the region’s limited rainfall. The Parnaíba River, a vital waterway, flows nearby, influencing local humidity levels, though not directly impacting the city centre. Canto do Buriti’s urban character is that of a small, developing town, with a clear urban-rural gradient as it transitions into the agricultural lands dominating the wider region. Agriculture, primarily subsistence farming and livestock rearing, is the dominant economic activity. This agricultural practice, including potential seasonal burning for land clearing, is a key factor influencing local air quality. The city’s elevation is relatively low, contributing to limited atmospheric dispersion of pollutants. There are no major industrial belts within Canto do Buriti itself, but regional transport routes and potential dust from exposed soil contribute to particulate matter in the air. The Caatinga’s inherent dryness and susceptibility to desertification further exacerbate these conditions, making air quality management a crucial concern.

Air quality in Canto do Buriti follows a distinct wet-dry seasonal pattern dictated by the region’s semi-arid climate. The wet season, typically spanning November to March, brings temporary relief from particulate matter as rainfall effectively washes dust and pollutants from the atmosphere. However, increased humidity can also foster mold growth, potentially impacting respiratory health. The dry season, from April to October, is when air quality concerns peak. This is due to increased dust resuspension from agricultural activities, drier vegetation, and a higher frequency of wildfires, both natural and anthropogenic. August and September are often the worst months, coinciding with the peak of the dry season and agricultural burning. Temperature inversions, common during cooler nights in the dry season, trap pollutants near the ground, worsening air quality. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit strenuous outdoor activity during these periods. Wind patterns, generally easterly, can transport pollutants from surrounding agricultural areas into the city. Monitoring wind direction and avoiding outdoor exertion on still, dry days is advisable. The transition months of October and November see fluctuating conditions, requiring continued vigilance.