Marigliano Air Quality Index (AQI)

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Marigliano, nestled in the Campania region of Italy, presents a complex geographical setting influencing its air quality. Located approximately 20km northeast of Naples, the city occupies a position within the fertile Plain of the Sarno, a historically agricultural area now experiencing increasing urban sprawl. The terrain is relatively flat, rising gently towards the slopes of Mount Vesuvius to the southeast, creating a basin-like effect that can trap pollutants. At an elevation of around 40 meters above sea level, Marigliano benefits from a Mediterranean climate but is susceptible to stagnant air masses. The proximity to Naples, a major industrial and port city, introduces a significant source of regional pollution, transported by prevailing winds. Surrounding Marigliano are intensive agricultural lands, contributing to ammonia emissions from fertilizer use, and smaller industrial zones focused on food processing and light manufacturing. The urban-rural gradient is becoming increasingly blurred as Naples’ conurbation expands, leading to a reduction in natural ventilation and increased localised emissions from traffic and domestic heating. This combination of factors creates a challenging environment for maintaining optimal air quality, particularly during periods of low wind speed and temperature inversions.

Marigliano’s air quality follows a distinct seasonal pattern. Winter, from December to February, typically sees the highest pollution levels. Low temperatures encourage increased use of wood and fossil fuel for heating, coupled with frequent temperature inversions trapping pollutants near the ground. Calm wind conditions exacerbate this, leading to a build-up of particulate matter and nitrogen dioxide. Spring (March-May) brings some improvement as temperatures rise and heating demand decreases, but agricultural activities, including fertilizer application, contribute to ammonia concentrations. Summer (June-August) generally offers the cleanest air, driven by strong southerly breezes that disperse pollutants and higher temperatures promoting atmospheric mixing. However, intense sunshine can also facilitate photochemical smog formation. Autumn (September-November) sees a gradual deterioration as heating use resumes and agricultural practices continue. Sensitive individuals – children, the elderly, and those with respiratory conditions – should be particularly cautious during winter and early spring. Months to avoid strenuous outdoor activity are December, January, and February. Monitoring wind direction and avoiding peak traffic hours are advisable throughout the year. Fog, common in the cooler months, can further concentrate pollutants.