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Viana, Espírito Santo, Brazil, occupies a geographically dynamic position on the southeastern coast, nestled between the Atlantic Ocean and the Serra do Mar mountain range. Its coordinates, -20.3893, -40.4948, place it within a subtropical climate zone, significantly influencing its air quality profile. The city’s terrain is characterized by steep slopes and valleys, a consequence of the Serra do Mar’s erosional forces, creating a complex urban landscape. This topography can trap pollutants, particularly in the lower-lying areas closer to the coast. Viana’s urban fabric blends coastal settlements with hillside communities, exhibiting a distinct urban-rural gradient. The surrounding landscape is a mosaic of dense Atlantic Forest, agricultural lands (primarily sugarcane and cocoa), and expanding urban areas. The proximity to Vitória, the state capital, and its associated industrial belt, introduces a regional pollution influence, with potential for transboundary air pollution events. The city’s coastline, while offering scenic beauty, also contributes to the potential for sea salt aerosol deposition, which can interact with other pollutants. Agricultural activities, particularly burning practices associated with land clearing and sugarcane cultivation, are a localized source of particulate matter. The elevation varies considerably, ranging from sea level along the coast to higher elevations within the Serra do Mar, impacting ventilation patterns and pollutant dispersion. The interplay of these factors – coastal location, mountainous terrain, agricultural activity, and proximity to industrial zones – creates a unique set of challenges for maintaining clean air in Viana.

Viana’s subtropical climate dictates a distinct wet and dry season pattern, profoundly impacting its air quality. The dry season, typically from May to September, often sees a build-up of pollutants due to reduced rainfall and decreased atmospheric mixing. During this period, stagnant air masses are more common, particularly within the valleys and lower elevations, leading to potential episodes of elevated particulate matter. Agricultural burning, a traditional practice, intensifies during the dry season to clear land for planting, significantly contributing to localized smoke pollution. The wet season, from October to April, brings increased rainfall and higher humidity, which naturally scavenges pollutants from the atmosphere, leading to improved air quality. However, periods of intense rainfall can also mobilize dust and soil particles, temporarily increasing particulate levels. Fog, more frequent during the cooler months (June-August), can trap pollutants near the ground, exacerbating localized air quality issues. Temperature inversions, where cooler air is trapped beneath warmer air, are also more likely during the dry season, hindering vertical mixing and concentrating pollutants. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly on days with agricultural burning or stagnant air. Outdoor activities are generally more favorable during the wet season, although vigilance regarding potential dust events remains important. The interplay of these meteorological factors creates a dynamic air quality landscape throughout the year in Viana.