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Foz do Iguaçu occupies a unique geographic position at the tri-border junction of Brazil, Argentina, and Paraguay, nestled within the Upper Paraná Plateau region of southwestern Paraná state. The city's urban character is defined by its role as a major international tourism gateway to the iconic Iguaçu Falls, creating a distinctive blend of urban infrastructure supporting both residents and millions of annual visitors. Situated at approximately 180 meters above sea level, Foz do Iguaçu's terrain features gently rolling hills transitioning to the dramatic Iguaçu River canyon just east of the city center. This location profoundly influences air quality through multiple mechanisms: the city lies within the Atlantic Forest biome, with surrounding protected areas creating a partial green buffer, yet urban expansion has created distinct urban-rural gradients. Proximity to the massive Itaipu Dam reservoir and the Iguaçu River provides some atmospheric moisture but minimal pollution dispersion benefits. The tri-border region includes Ciudad del Este (Paraguay) and Puerto Iguazú (Argentina), forming a conurbation with combined industrial and commercial activity that generates transboundary pollution flows. Agricultural zones in the surrounding Paraná countryside contribute occasional biomass burning particulates, while the city's own pollution stems primarily from vehicle emissions (especially tourism-related traffic), residential combustion, and construction dust. The region's topography creates occasional temperature inversions in valley areas, trapping pollutants near ground level.

Foz do Iguaçu experiences distinct seasonal air quality patterns shaped by its humid subtropical climate, with pollution levels fluctuating according to meteorological conditions and human activity cycles. During summer (December-February), increased tourism traffic and higher temperatures combine with occasional stagnant air masses to elevate particulate and ozone levels, particularly in January when visitor numbers peak; sensitive individuals should limit strenuous afternoon activities during heatwaves. Autumn (March-May) brings gradual improvement as tourism declines and more frequent cold fronts from the south enhance atmospheric dispersion, making April-May favorable for outdoor recreation. Winter (June-August) presents a mixed picture: while cooler temperatures reduce some pollution formation, increased residential wood burning for heating and frequent morning radiation fog can trap particulates near the surface, creating poor air quality episodes especially in July; children, elderly, and those with respiratory conditions should monitor morning air quality reports. Spring (September-November) sees improving conditions as warmer temperatures return and rainfall increases, though October can experience elevated dust levels from agricultural preparation and construction activity before the summer rains fully establish. Throughout the year, wind patterns play a crucial role—easterly winds from the Atlantic generally bring cleaner air, while northerly flows may transport smoke from distant agricultural burns.