Peritoró Air Quality Index (AQI)

Loading live AQI data...

Loading weather snapshot...

Loading historical AQI trends...

Peritoró, nestled in the southeastern Maranhão state of Brazil, occupies a geographically significant position within the Tocantins-Araguaia River basin. Located at approximately -4.3828° latitude and -44.3328° longitude, the city’s terrain is characterized by undulating plains and low hills, typical of the Brazilian Cerrado biome. The surrounding landscape is a mosaic of cerrado vegetation, transitioning into areas of pastureland and agricultural fields, reflecting the region’s agricultural economy. Peritoró sits relatively close to the Itapecuru River, a tributary of the Tocantins, influencing local humidity and microclimates. The urban footprint is compact, reflecting its relatively small population of 20,479, exhibiting a clear urban–rural gradient as one moves outwards. While not directly adjacent to major industrial belts, Peritoró’s proximity to larger agricultural zones in Maranhão means agricultural practices, including burning for land clearing (though increasingly regulated), can contribute to regional air quality. The city’s elevation, generally low, contributes to potential temperature inversions, particularly during drier periods, which can trap pollutants near the ground. The regional climate is tropical, with distinct wet and dry seasons, impacting atmospheric stability and dispersion patterns. The prevailing winds, often influenced by the larger river systems, play a crucial role in the movement of airborne particles and gases, affecting air quality within and around Peritoró. The city’s location within a basin also limits the effective dispersal of pollutants, potentially exacerbating local air quality challenges.

Peritoró’s tropical climate dictates a distinct wet and dry season cycle, profoundly influencing its air quality. The dry season, typically spanning from May to September, is characterized by reduced rainfall and increased temperatures. This period often sees a rise in particulate matter due to agricultural burning, a traditional practice for land preparation, although increasingly restricted by environmental regulations. The lack of rainfall and drier conditions also contribute to increased dust levels, particularly during windy periods. Temperature inversions are more frequent during the dry season, trapping pollutants closer to the ground, especially in the mornings. Conversely, the wet season (October to April) brings increased rainfall, which naturally washes pollutants from the atmosphere, leading to improved air quality. Higher humidity also reduces dust generation. However, periods of intense rainfall can sometimes lead to localized flooding, potentially releasing pollutants from inundated areas. The monsoon-like patterns of the wet season, with periods of heavy downpour followed by calmer intervals, influence the dispersion of any remaining pollutants. During the transition months (April/May and September/October), air quality can be variable, influenced by shifting wind patterns and the interplay between the retreating dry season conditions and the approaching wet season. Sensitive groups, such as children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly during periods of agricultural activity and when temperature inversions are likely. Outdoor activities are generally more favorable during the wet season, although vigilance regarding potential flooding is advised.