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La Unión, nestled in the Piura region of northern Peru, presents a unique geographic context influencing its air quality. Situated at approximately -5.4022 latitude and -80.7422 longitude, the city lies relatively close to the Pacific coastline, roughly 30 kilometers inland, but is shielded from direct marine influence by a coastal plain. The terrain is characterized by a semi-arid landscape transitioning into foothills as one moves eastward towards the Andes. La Unión’s elevation is modest, around 100 meters above sea level, contributing to limited atmospheric dispersion. The city’s urban character is defined by a mix of residential areas and commercial activity, historically linked to sugar cane cultivation and processing. Surrounding La Unión are extensive agricultural zones, particularly sugar cane plantations, which contribute to seasonal burning practices. The urban-rural gradient is relatively sharp, with agricultural land immediately bordering the city limits. This proximity to agricultural activity, combined with the limited topographical features to facilitate air circulation, creates conditions conducive to localized air pollution events. Dust from agricultural practices and potential emissions from processing facilities are key concerns. The prevailing winds, generally from the south, can transport pollutants from these sources directly over the city, impacting air quality.

La Unión experiences a distinct dry season (roughly May to November) and a wet season (December to April), heavily influencing air quality. During the dry season, reduced rainfall leads to increased dust resuspension from agricultural lands and unpaved roads, elevating particulate matter concentrations. The lack of precipitation also inhibits the natural cleansing of the atmosphere. Temperature inversions, common during the cooler nights of the dry season, trap pollutants near the ground, exacerbating air quality issues. November and December often see the poorest air quality as agricultural burning peaks before the rains arrive. The wet season brings temporary relief, with rainfall washing away pollutants and increasing atmospheric humidity, which can suppress dust. However, increased humidity can also promote the formation of mold and other biological pollutants indoors. March and April, as the wet season wanes, can experience fluctuating air quality. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during the dry season, particularly in November and December. During the wet season, maintaining good indoor ventilation is crucial to mitigate biological pollutant build-up. Monitoring weather patterns and local agricultural practices is key to anticipating pollution episodes.