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Valencia, situated in Spain's Andalusia region along the southeastern Mediterranean coast, occupies a distinctive geographic position that profoundly shapes its air quality dynamics. The city lies within the fertile Huerta de Valencia plain, surrounded by agricultural zones that contribute to its pollution profile through pesticide and fertilizer emissions. Valencia's urban character blends historic architecture with modern development, creating a complex urban-rural gradient where dense city centers transition to peri-urban agricultural lands. The city's elevation remains relatively low, averaging just 15 meters above sea level, which limits natural ventilation and allows pollutants to accumulate. Proximity to the Mediterranean Sea creates a moderating influence on temperatures but also positions Valencia as a major port city, with shipping emissions contributing significantly to air pollution. The surrounding landscape includes coastal wetlands to the east and mountainous terrain to the west, which can trap pollutants during certain weather conditions. Valencia's location within an industrial belt stretching along Spain's Mediterranean coast adds manufacturing emissions to its pollution mix, while the city's position makes it vulnerable to transboundary Saharan dust events that periodically degrade air quality across the region.

Valencia's Mediterranean climate creates distinct seasonal patterns in air quality that residents and visitors should understand for health planning. During autumn, particularly in November, pollution begins to intensify as cooler temperatures combine with reduced wind speeds, creating atmospheric stagnation that traps vehicle exhaust and port emissions near ground level. Winter months from December through January represent the peak pollution period, when temperature inversions become frequent in the low-lying urban basin, preventing vertical dispersion of pollutants while increased heating emissions from buildings add to the burden. Sensitive groups including those with respiratory conditions should limit prolonged outdoor exposure during these months, especially on calm, clear days when inversion layers are strongest. Spring brings gradual improvement as increased precipitation helps wash pollutants from the air, though occasional Saharan dust events can create temporary spikes in particulate matter. Summer offers the cleanest air despite heatwaves, as stronger sea breezes ventilate the urban area and disperse pollutants, though ozone levels may rise during afternoon hours. The optimal months for outdoor activities are typically May through September, while November through January require greater caution, particularly for vulnerable populations who should monitor local air quality advisories and plan activities for mornings when pollution levels tend to be lower.