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Itanhaém, nestled along the Atlantic coastline of São Paulo state, Brazil, presents a unique geographic setting influencing its air quality. Located at -24.1831 latitude and -46.7889 longitude, the city occupies a relatively flat coastal plain, transitioning inland to gently rolling hills. This terrain, combined with its proximity to the ocean, creates a complex interplay of meteorological conditions. The city’s urban area is interspersed with remnants of the Atlantic Forest, a crucial biome for air purification, though increasingly fragmented by development. Itanhaém’s position south of the heavily industrialized Santos region and the metropolitan area of São Paulo means it can receive pollutants transported by prevailing winds. Agriculture, particularly sugarcane and fruit cultivation, dominates the surrounding rural areas, contributing to seasonal biomass burning. The urban-rural gradient is pronounced, with denser development concentrated near the coastline and more dispersed settlements further inland. The Mogi River estuary influences local humidity and wind patterns, potentially trapping pollutants during calm periods. The city’s elevation is low, averaging around 8 meters, making it susceptible to marine influences and limited atmospheric dispersion. This coastal location, while offering recreational benefits, also presents challenges for maintaining clean air.

Itanhaém experiences a humid subtropical climate, characterized by warm, wet summers and mild, drier winters. Air quality fluctuates significantly throughout the year. During the summer months (December-February), increased humidity and stagnant air masses can trap pollutants, particularly those originating from regional industrial sources and biomass burning related to agricultural practices. Rainfall, while frequent, doesn’t always fully cleanse the air due to the prevailing wind patterns. Autumn (March-May) typically sees a gradual improvement in air quality as agricultural burning subsides and rainfall increases. Winter (June-August) is generally the period with the best air quality, due to cooler temperatures, increased wind speeds, and reduced agricultural activity. However, temperature inversions can occur, trapping pollutants near the ground. Spring (September-November) marks a transition period, with increasing temperatures and the potential for renewed agricultural activity, leading to a gradual decline in air quality. Sensitive individuals, such as children, the elderly, and those with respiratory conditions, should be particularly cautious during the summer and spring months. Monitoring wind direction is crucial; winds from the north and northwest often carry pollutants from inland sources. Avoiding strenuous outdoor activity on still, humid days is advisable.