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Pacasmayo, nestled in the La Libertad region of northern Peru, occupies a geographically complex position significantly influencing its air quality. Situated at approximately -7.4003° latitude and -79.5700° longitude, the city lies close to the Pacific coast, at an elevation of roughly 15 meters above sea level. This coastal proximity introduces a maritime influence, often bringing humidity and fog, which can trap pollutants under certain atmospheric conditions. The surrounding landscape is a blend of arid coastal plains transitioning into the foothills of the Andes Mountains to the east. This terrain creates a natural funnel effect, potentially concentrating air pollutants within the Pacasmayo valley, particularly during periods of low wind. The city’s urban character is primarily residential and commercial, with a developing industrial sector focused on fishing and processing, and some agricultural activity in the surrounding areas, including sugarcane and mango cultivation. The urban–rural gradient is relatively sharp, with agricultural lands quickly giving way to the urban core. Further inland, the Andes provide a significant topographic barrier, impacting regional wind patterns and potentially contributing to temperature inversions. The presence of the Pacific Ocean also introduces the possibility of marine aerosols impacting local air composition. The valley's geography, combined with human activity, creates a unique microclimate that directly affects the dispersal and concentration of airborne pollutants.

Pacasmayo’s air quality experiences a distinct seasonal pattern dictated by its tropical climate, characterized by a wet and a dry season. The dry season, typically spanning from May to October, often sees periods of stagnant air and increased particulate matter. Reduced rainfall means less natural cleansing of the atmosphere, and the lack of strong winds allows pollutants from local sources – fishing vessels, agricultural burning (though regulated, occasional occurrences happen), and vehicle emissions – to accumulate. Temperature inversions, common during this period, trap cooler air near the ground, further hindering vertical mixing and exacerbating pollution. Conversely, the wet season (November to April) brings increased rainfall and higher humidity, which generally improves air quality by washing away particulate matter and increasing atmospheric moisture. However, heavy rainfall can also lead to increased dust resuspension from unpaved roads and construction sites. Fog, frequently occurring along the coast, can also trap pollutants, creating localized pockets of poor air quality. The months of July and August often present the most challenging conditions due to persistent temperature inversions and minimal rainfall. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit outdoor exertion during these periods. During the wet season, while overall air quality improves, those with allergies should be mindful of pollen and mold spores.