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Santa Teresa, nestled within the Carazo department of Nicaragua, presents a fascinating case study in rural-urban air quality dynamics. Situated at coordinates 11.7333, -86.2167, the city occupies a relatively low-lying area within the Pacific lowlands, approximately 60 meters above sea level. This proximity to the Pacific Ocean influences local weather patterns, bringing humidity and occasional sea breezes. The surrounding landscape is dominated by agricultural land, primarily dedicated to sugarcane and cattle ranching, which significantly impacts the regional air quality profile. Unlike larger Nicaraguan cities with concentrated industrial zones, Santa Teresa’s pollution sources are more diffuse, stemming from agricultural practices – including burning of crop residue – and vehicle emissions along the Pan-American Highway which passes nearby. The urban-rural gradient is quite sharp; the city itself is compact with a population of around 16,891, quickly transitioning to open farmland. Topography is generally flat, limiting natural ventilation and potentially exacerbating pollutant concentrations during calm weather conditions. Dust from unpaved roads and agricultural activities also contributes to particulate matter levels. The city’s location within a volcanic region, while not currently actively volcanic, means soil composition can influence dust characteristics.

Santa Teresa experiences a distinct bimodal rainfall pattern, defining its ‘seasons’ rather than traditional four-season cycles. The dry season, typically from December to April, is characterized by lower rainfall and increased dust resuspension from agricultural lands and roads. This period often sees the highest levels of particulate matter, particularly PM10, due to drier conditions and increased burning for land preparation. February and March are generally the months with the poorest air quality. The transition periods (May and November) bring fluctuating conditions, with intermittent rainfall offering temporary relief. The wet season, spanning May to November, generally improves air quality as rainfall washes away pollutants and suppresses dust. However, increased humidity can also promote the formation of mold and other biological pollutants indoors. August and September, while wet, can experience localized flooding which can stir up sediment and impact waterborne disease risks. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during the dry season and take precautions during periods of heavy rainfall. Monitoring wind direction is crucial, as prevailing winds can carry pollutants from agricultural burning into the city.