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Valencia, Spain's third-largest city, occupies a strategic position on the eastern Iberian Peninsula along the Mediterranean coast, where the Turia River meets the sea. This coastal metropolis sits within the expansive Huerta de Valencia—a fertile agricultural plain irrigated by centuries-old canal systems—creating a distinct urban-rural gradient where dense urban cores transition to citrus groves and rice paddies. The city's elevation remains modest, averaging just 15 meters above sea level, with the coastal plain bounded by low-lying hills to the west that minimally disrupt airflow patterns. Valencia's Mediterranean location subjects it to sea breezes that typically disperse pollutants, yet its position in a semi-enclosed basin can trap emissions during atmospheric stagnation. The metropolitan area's industrial belt concentrates along the southern periphery near the port—Europe's busiest Mediterranean container terminal—where shipping, logistics, and manufacturing activities contribute particulate matter and nitrogen oxides. Urban expansion has created a sprawling metropolitan region of nearly 1.6 million inhabitants, with traffic congestion along radial corridors generating vehicle emissions that mingle with agricultural ammonia from surrounding farmland. The city's proximity to the Mediterranean Sea provides natural ventilation, but during anticyclonic conditions, pollutants accumulate over the urban heat island, exacerbated by the surrounding mountains' rain shadow effect that limits precipitation cleansing.

Valencia's Mediterranean climate creates distinct seasonal air quality patterns influenced by meteorological conditions rather than extreme pollution events. During winter (December-February), cooler temperatures and frequent atmospheric inversions trap pollutants close to the ground, particularly during calm, high-pressure systems that stagnate over eastern Spain. These conditions often coincide with increased residential heating emissions, making late January and February the period when sensitive groups should limit prolonged outdoor exertion. Spring (March-May) brings improving conditions as rising temperatures and sea breezes enhance dispersion, though pollen from Valencia's extensive orange groves can aggravate respiratory allergies. Summer (June-August) offers generally good air quality despite intense sunlight that accelerates ozone formation from vehicle emissions; afternoon sea breezes typically clear pollutants, but heatwaves in July and August can temporarily elevate ozone levels, making early mornings preferable for outdoor activities. Autumn (September-November) sees variable conditions—September maintains summer-like dispersion, while October and November may experience occasional stagnation as seasonal transitions occur. Sensitive individuals should monitor local air quality reports during winter inversion episodes and summer heatwaves, when particulate matter and ozone respectively peak. Valencia's coastal location generally prevents the severe pollution episodes seen in continental cities, but urban emissions combined with specific meteorological conditions warrant seasonal awareness.