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Arsin, a district of Trabzon Province in northeastern Turkey, occupies a unique geographic position along the Black Sea coast. Situated at coordinates 40.9500° N, 39.9333° E, the city’s terrain is characterised by a steep coastal plain rising rapidly into the Pontic Mountains. This topography significantly influences local air quality. Arsin’s elevation, though varying within the district, generally contributes to cooler temperatures and increased precipitation compared to inland areas. The Black Sea exerts a moderating influence on the climate, but also creates conditions conducive to temperature inversions, trapping pollutants near the ground. The surrounding landscape is a mix of tea plantations – a dominant agricultural feature of the region – forested hillsides, and increasingly, urban development. While Arsin isn’t a major industrial hub, the broader Trabzon province has some industrial activity, and prevailing winds can transport pollutants from these sources. The urban-rural gradient is relatively sharp, with agricultural land bordering the city limits. This proximity means agricultural practices, including the burning of agricultural waste, can contribute to localised air pollution episodes. The coastal location also means salt spray and marine aerosols are present in the air, impacting particulate matter composition.

Arsin’s air quality follows a distinct seasonal pattern. Winter (December-February) typically sees the poorest air quality, driven by increased reliance on coal and wood for heating, coupled with frequent temperature inversions caused by the cold, stable air masses over the Black Sea. These inversions trap pollutants close to the ground, leading to higher concentrations of particulate matter and sulfur dioxide. Spring (March-May) brings improvement as temperatures rise and heating demand decreases, but rainfall is often high, potentially washing pollutants from the atmosphere. Summer (June-August) generally offers the cleanest air, benefiting from sea breezes and warmer temperatures that promote atmospheric mixing. However, increased tourism and traffic can lead to localised increases in nitrogen oxides. Autumn (September-November) is a transitional period, with air quality gradually declining as heating season approaches. Fog is common during autumn and winter, exacerbating pollution. Sensitive groups – the elderly, children, and those with respiratory conditions – should limit strenuous outdoor activity during winter months and periods of fog. Monitoring wind direction is crucial; winds from inland industrial areas can bring higher pollution levels. The wet season, broadly spanning autumn and winter, offers some natural cleansing, but doesn’t eliminate pollution risks.