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Itaugua, Paraguay, nestled within the Central state, occupies a geographically significant position within the South American Gran Chaco region. Located at approximately -25.3926° latitude and -57.3542° longitude, the city’s terrain is predominantly characterized by gently rolling plains, typical of the Paranaense biogeographic province. The elevation is relatively low, averaging around 180 meters above sea level, contributing to a stable atmospheric layer that can, under certain conditions, trap pollutants. Itaugua sits approximately 35 kilometers west of Asunción, Paraguay’s capital, forming part of the Greater Asunción metropolitan area, a crucial factor influencing its air quality. The surrounding landscape is a mosaic of agricultural land – primarily soybean and maize cultivation – interspersed with cattle ranches and smaller settlements. This agricultural belt contributes to seasonal particulate matter, particularly during harvest periods. To the east, the Ypacaraí Lake provides a localized moderating influence on humidity and temperature, though its impact on broader air circulation is limited. The urban–rural gradient around Itaugua is relatively gradual, with agricultural activities extending close to the city limits. Industrial activity, while not as extensive as in Asunción, is present, primarily focused on textile manufacturing and food processing, both of which can contribute to localized emissions. The city’s location within a subtropical climate zone, combined with its flat topography and proximity to intensive agricultural practices, creates a setting where air quality is susceptible to both regional and local pollution sources.

Itaugua’s subtropical climate dictates a distinct wet and dry seasonal pattern, profoundly impacting air quality. The dry season, typically spanning from April to October, is often characterized by lower rainfall and increased temperatures. This period frequently sees a build-up of particulate matter, stemming from agricultural activities like harvesting and soil preparation, exacerbated by drier conditions that minimize pollutant washout. Temperature inversions, common during the cooler nights of the dry season, trap pollutants close to the ground, leading to periods of reduced visibility and potentially elevated concentrations of certain pollutants. The wet season, from November to March, brings increased rainfall and higher humidity. These conditions naturally cleanse the atmosphere, washing away particulate matter and diluting gaseous pollutants. However, heavy rainfall can also lead to increased levels of ozone, formed through photochemical reactions involving humidity and sunlight. The months of July and August, within the dry season, are generally considered periods when outdoor activities should be approached with caution, particularly for individuals with respiratory sensitivities. Conversely, February and March, during the wet season, typically offer improved air quality. Sensitive groups, including children, the elderly, and those with pre-existing respiratory conditions, should monitor local conditions and limit prolonged outdoor exposure during periods of stagnant air or visible haze, regardless of the season. Maintaining indoor air quality through proper ventilation and air filtration can also provide a degree of protection.