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Nestled along the Tyrrhenian Sea in southern Italy, Naples occupies a dramatic coastal plain at the foot of Mount Vesuvius, creating a unique geographic setting that profoundly influences its air quality. The city's urban character is dense and historic, with narrow streets and high population density in the historic centre, while sprawling suburbs extend into the surrounding Campanian plain. Positioned within the Campania region, Naples serves as the economic and cultural hub, surrounded by the volcanic landscape of the Vesuvius Valley to the east and the Phlegraean Fields to the west. The terrain slopes gently from the sea inland, with elevations ranging from sea level to about 150 metres in urban areas, though nearby hills and mountains rise sharply. Proximity to the Tyrrhenian Sea provides some maritime influence, but the city's location in a semi-enclosed bay limits sea breezes, while the Vesuvius Valley acts as a natural basin that traps pollutants. The urban-rural gradient transitions quickly from dense urban fabric to agricultural zones in the hinterland, known as the Campania felix, though industrial belts around the port and neighbouring municipalities like Pozzuoli add significant emissions. This combination of topographic confinement, high traffic density, and industrial activity creates persistent air quality challenges, exacerbated by the valley's tendency to accumulate airborne particulates from both local sources and regional transport.

Naples experiences distinct seasonal variations in air quality, driven by its Mediterranean climate and local meteorological patterns. In winter, from November to February, pollution peaks due to a combination of factors: increased residential heating emissions, particularly from older wood and coal systems, frequent temperature inversions that trap pollutants in the Vesuvius Valley, and reduced wind speeds that limit dispersion. This period sees elevated levels of PM2.5 and PM10, making outdoor activities less favourable, especially for sensitive groups like children, the elderly, and those with respiratory conditions, who should limit exertion on calm, cold days. Spring brings gradual improvement as temperatures rise, winds increase, and rainfall helps cleanse the air, though occasional Saharan dust intrusions can temporarily spike particulate levels. Summer, from June to August, offers the best air quality for outdoor activities, with sea breezes and higher atmospheric mixing dispersing pollutants, though heatwaves can lead to ozone formation from vehicle exhaust, posing risks during midday hours. Autumn sees a return to deteriorating conditions as temperatures drop, heating resumes, and stagnant air masses become more common, with October often marking the onset of the pollution season. Sensitive individuals should monitor local air quality reports year-round, favour morning hours for exercise in warmer months, and consider indoor alternatives during winter peaks.