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Itajubá, nestled in the Serra da Mantiqueira mountain range of Minas Gerais, Brazil, occupies a geographically significant position within the southeastern region. Located at approximately -22.4258° latitude and -45.4528° longitude, the city sits at an elevation of around 880 meters (2,887 feet) above sea level, contributing to a cooler climate compared to lower-lying areas of Brazil. The surrounding landscape is dominated by rolling hills, dense Atlantic Forest remnants, and agricultural land, creating a distinct urban–rural gradient. The city’s terrain is characterized by steep slopes and valleys, influencing drainage patterns and potentially trapping pollutants under certain meteorological conditions. While Itajubá isn't directly adjacent to a major river, several smaller streams and tributaries flow through the region, impacting local microclimates and water quality. The city’s regional position places it within a zone experiencing a transition between humid subtropical and tropical highland climates. Historically, the area supported coffee plantations, and agriculture remains a component of the regional economy, though Itajubá has evolved into a significant industrial hub, particularly known for its metalworking and precision engineering sectors. This industrial activity, combined with the topography, can create localized air quality challenges, especially during periods of stagnant air. The surrounding forests, while providing some natural air filtration, are increasingly fragmented, reducing their overall impact on regional air quality. The city’s layout reflects its mountainous setting, with a mix of dense urban areas and more dispersed residential zones clinging to the hillsides.

Itajubá experiences a tropical savanna climate, characterized by distinct wet and dry seasons rather than the four traditional seasons. The dry season, typically spanning from April to September, often sees a noticeable increase in air quality concerns. During this period, reduced rainfall leads to lower atmospheric moisture, which can exacerbate the effects of particulate matter. Temperature inversions, common during the cooler, drier months, trap pollutants closer to the ground, particularly in the valleys and lower-lying areas of the city. The dry season’s prevailing winds are often weaker, further contributing to stagnation. Conversely, the wet season (October to March) brings increased rainfall, which naturally washes pollutants from the atmosphere, leading to improved air quality. However, heavy rainfall events can also temporarily elevate particulate matter due to soil erosion and resuspension. Fog, a frequent occurrence during the cooler months, can also trap pollutants, creating localized pockets of poor air quality. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly during periods of stagnant air or fog. Outdoor activities are generally more favorable during the wet season, although vigilance regarding potential soil erosion impacts is still advised. The agricultural practices in the surrounding areas, particularly during harvest times, can also contribute to seasonal variations in air quality, with increased dust and smoke potentially impacting the city’s atmosphere. The interplay of these meteorological factors dictates the overall air quality profile throughout the year.