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São Pedro do Piauí, nestled in the southeastern corner of the state of Piauí, Brazil, occupies a geographically significant position within the Cerrado biome. Located at approximately -5.9289° latitude and -42.7189° longitude, the city’s terrain is characterized by undulating plains and gently sloping hills, typical of the region's transition zone between the Cerrado and Caatinga ecosystems. The elevation averages around 400 meters above sea level, contributing to a relatively stable atmospheric layer, though susceptible to temperature inversions under specific conditions. The surrounding landscape is dominated by the vast expanse of the Cerrado, a savanna-like environment with scattered trees, shrubs, and grasslands. While São Pedro do Piauí lacks immediate proximity to major rivers, it benefits from seasonal streams and rainwater collection, crucial for the region's water resources. The urban footprint is small, reflecting the city’s rural character and limited industrial activity. Agriculture, primarily subsistence farming and cattle ranching, forms the backbone of the local economy, with fields extending outwards into the Cerrado. This creates a gradual urban–rural gradient, where agricultural practices can influence local air quality, particularly through the use of controlled burns during land clearing and harvesting. The city’s isolation, while preserving its natural environment, also limits the impact of larger industrial belts found further west, but localized agricultural emissions remain a factor. The prevailing winds generally flow from the northeast, carrying air masses across the Cerrado, potentially dispersing or concentrating pollutants depending on atmospheric stability.

São Pedro do Piauí experiences a tropical savanna climate, defined by distinct wet and dry seasons rather than the four traditional seasons. The dry season, typically spanning from May to September, is characterized by lower humidity, higher temperatures, and a greater risk of wildfires. This period often sees a noticeable increase in particulate matter in the air, stemming from agricultural burning practices used to clear land and prepare fields for planting. The lack of rainfall during these months also reduces atmospheric cleansing, allowing pollutants to linger. Conversely, the wet season, from October to April, brings frequent rainfall and increased humidity, naturally scrubbing the atmosphere and significantly improving air quality. The higher rainfall washes away particulate matter and reduces the likelihood of wildfires. During the transition months (April/May and September/October), the air quality is generally moderate, influenced by the shifting weather patterns. Fog, though infrequent, can occasionally form during the cooler, drier months, trapping pollutants near the ground and creating localized air quality concerns. Sensitive groups, such as children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly on days with visible smoke or haze. Outdoor activities are generally more favorable during the wet season, when rainfall and humidity contribute to cleaner air. While large-scale industrial pollution is minimal, awareness of agricultural practices and their impact on air quality is crucial for public health, especially during the dry months when controlled burns are more prevalent.