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Campo Grande, the capital of Mato Grosso do Sul in Brazil, is strategically positioned in the heart of South America's central plateau, with coordinates at -20.4686 latitude and -54.6222 longitude. This city lies at an elevation of approximately 530 meters above sea level, which moderates its tropical climate and influences air dispersion patterns. Situated on the Maracaju Plateau, Campo Grande is surrounded by a mosaic of cerrado savanna, agricultural expanses, and remnants of the Pantanal wetlands to the west, creating a distinct urban-rural gradient that shapes its air quality dynamics. The city's geography is characterized by gently rolling hills and sparse water bodies, with no major rivers or lakes in immediate proximity, limiting natural humidification effects that might otherwise help mitigate particulate matter. As a regional hub, Campo Grande serves as a critical node for agribusiness, with its economy deeply tied to soybean, cattle, and sugarcane production in the surrounding plains. This agricultural belt contributes to seasonal biomass burning and dust emissions, while urban sources like vehicle traffic, construction, and residential heating during cooler months add to the pollution mix. The city's location inland, away from coastal influences, means it experiences stable atmospheric conditions that can trap pollutants, particularly during dry seasons when rainfall is scarce. The interplay of its elevated terrain, which can foster temperature inversions, and its position within Brazil's agricultural heartland makes air quality in Campo Grande a product of both urban activity and rural environmental pressures, with particulate matter often dominating the pollution profile due to soil dust and agricultural residues.

In Campo Grande, air quality follows a distinct seasonal rhythm shaped by its tropical savanna climate, with a wet summer from October to March and a dry winter from April to September. During the summer months, particularly from December to February, increased rainfall helps cleanse the atmosphere, reducing particulate matter and improving air quality, making this period favourable for outdoor activities. However, occasional biomass burning from agricultural practices in surrounding areas can cause short-term spikes in pollution. As autumn arrives in March and April, transitioning into the dry winter, pollution levels begin to rise due to reduced precipitation and more frequent temperature inversions that trap pollutants near the ground. The peak pollution months typically occur from May to August, when cold, stable air masses lead to persistent inversions, especially at night and in early mornings, exacerbating issues from urban emissions and dust from unpaved roads. Sensitive groups, such as those with respiratory conditions, should limit outdoor exertion during these months, particularly on calm, clear days when inversion layers are strongest. Spring, from September to November, sees a gradual improvement as rains return, dispersing pollutants and refreshing the air. Throughout the year, wind patterns from the southeast can bring cleaner air, but during the dry season, northerly winds may carry smoke from distant fires. Health guidance emphasizes monitoring local air quality reports, using masks during high-pollution episodes, and planning outdoor activities for late mornings when inversions often break.