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Baltiysk, situated in the Kaliningrad Oblast’ of Russia, occupies a uniquely strategic position on the Baltic Sea coast. The city’s geography is defined by its location on a narrow spit of land, the Curonian Spit, a UNESCO World Heritage site. This narrow, curved sand dune peninsula separates the Curonian Lagoon from the Baltic Sea, profoundly influencing local weather patterns and air quality. The terrain is predominantly flat, with low-lying coastal areas and shifting sand dunes. Baltiysk’s elevation is minimal, making it vulnerable to sea breezes and the accumulation of pollutants. Historically a major naval base, the city retains a strong military presence, and associated industrial activity contributes to localised emissions. Surrounding the city are expanses of pine forests and coastal vegetation, offering some natural filtration, but also susceptible to salt spray and marine aerosols. The urban-rural gradient is sharp; immediately outside the city limits lies the pristine, protected environment of the Curonian National Park. The prevailing winds, typically from the west and northwest, carry maritime influences and can either disperse or concentrate pollutants depending on atmospheric conditions. The proximity to the sea moderates temperatures but also increases humidity, potentially exacerbating the formation of secondary pollutants. This coastal setting creates a complex interplay between marine, industrial, and terrestrial influences on air quality.

Baltiysk experiences a temperate maritime climate, resulting in distinct seasonal air quality patterns. Winter (November to February) often sees calmer conditions and temperature inversions, trapping pollutants from heating sources and limited industrial activity near the ground, leading to periods of reduced air quality. Fog is common, further concentrating particulate matter. Spring (March to May) brings increased wind speeds, aiding dispersion, but also agricultural burning in surrounding areas can contribute to localised smoke. Summer (June to August) generally offers the best air quality, with strong sea breezes and higher temperatures promoting pollutant dispersal, though increased tourism can lead to higher vehicle emissions. However, stagnant high-pressure systems can still cause episodes of poor air quality. Autumn (September to October) is a transitional period, with decreasing temperatures and increasing frequency of inversions. Sensitive individuals, such as those with respiratory conditions, should be particularly cautious during winter and autumn. Months to favour for outdoor activity are June, July, and August. The Baltic Sea’s influence is constant, with marine aerosols contributing to particulate matter year-round. Monitoring wind direction is crucial; onshore winds can bring pollutants from the mainland, while offshore winds offer cleaner air.