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Premiá de Mar, nestled on the Mediterranean coastline of Catalonia, Spain, presents a unique geographic context influencing its air quality. The city occupies a relatively flat coastal plain, gently rising towards the Serralada Litoral range to the northwest. This terrain funnels breezes from the sea, which can both disperse and concentrate pollutants depending on meteorological conditions. Situated within the Barcelona Metropolitan Area, Premiá de Mar experiences the pressures of a densely populated and industrialized region. While the immediate surroundings are largely residential and recreational, with beaches dominating the seafront, the broader area features significant industrial activity concentrated further inland, particularly along the C-31 corridor. Agricultural zones, primarily vineyards and market gardens, are present in the hinterland, contributing to seasonal particulate matter from agricultural practices. The urban-rural gradient is relatively sharp, transitioning quickly from dense urban development to the more natural landscapes of the coastal hills. Proximity to the port of Barcelona, a major source of shipping emissions, also impacts regional air quality. The prevailing winds, generally from the southeast, can transport pollutants from Barcelona towards Premiá de Mar, while northerly winds can bring cleaner air from the Pyrenees.

Air quality in Premiá de Mar follows a distinct seasonal pattern. Summer months (June-August) typically experience better air quality, driven by consistent sea breezes that dilute pollutants and higher temperatures promoting atmospheric mixing. However, increased tourist activity and road traffic can locally elevate ozone levels, particularly during prolonged heatwaves. Autumn (September-November) sees a deterioration in air quality as temperatures drop and atmospheric stability increases, trapping pollutants. The first rains arrive, washing particulate matter from surfaces but also creating damp conditions conducive to secondary pollutant formation. Winter (December-February) often brings the poorest air quality, characterized by temperature inversions – warm air aloft trapping cooler, polluted air near the surface. Calm conditions and reduced sunlight limit pollutant dispersion. Spring (March-May) is a transitional period, with fluctuating conditions. March can be dusty due to Saharan dust events, while April and May see increasing photochemical smog formation as sunlight returns. Sensitive individuals – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during winter and periods of stagnant air. Monitoring pollen levels is also crucial in spring.