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Belén, nestled within the Concepción Department of Paraguay, presents a unique geographic context influencing its air quality. Situated at approximately -23.4695 latitude and -57.2400 longitude, the city lies on the western bank of the Paraguay River, a major fluvial artery for regional transport and commerce. The terrain is generally flat, characteristic of the Gran Chaco region, with a subtle rise moving westward. This flatness contributes to limited natural air dispersion. Belén’s urban character is that of a smaller, rapidly developing town, serving as a key transit point and agricultural hub. Surrounding the city are extensive agricultural lands, primarily dedicated to soybean and cattle farming, with associated land-use practices like controlled burns. Further south, the landscape transitions into the more densely forested Chaco. The Paraguay River, while providing a vital transport route, also contributes to humidity and potential fog formation, impacting pollutant dispersal. The urban-rural gradient is relatively sharp, with a quick transition from residential areas to agricultural fields. Industrial activity is limited within Belén itself, but regional transport and processing contribute to emissions. The proximity to the river and the flat topography create conditions where pollutants can accumulate, particularly during periods of low wind speed.

Belén experiences a subtropical climate with distinct wet and dry seasons, profoundly impacting air quality. The wet season, typically from November to April, brings increased rainfall which physically scrubs the air of particulate matter, generally resulting in improved air quality. However, high humidity can also trap pollutants closer to the ground. The dry season, from May to October, is characterized by lower rainfall and increased dust from agricultural activities and unpaved roads. This period sees a noticeable increase in particulate matter, especially PM10, due to wind erosion and burning of agricultural residue. August and September are often the dustiest months. Temperature inversions, common during the cooler nights of the dry season, exacerbate pollution by trapping pollutants near ground level. Strong winds from the south, prevalent in July and August, can temporarily improve conditions but also carry dust from further afield. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during the dry season, particularly in August and September. Monitoring local conditions and staying indoors on particularly dusty days is advisable. The transition periods (November and April) offer the most favourable air quality, with moderate temperatures and rainfall.