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Linghai is a county-level city situated in the southwestern part of Liaoning Province, China, positioned along the western coast of the Bohai Sea at coordinates 41.1667°N, 121.3500°E. This location places Linghai within the Liaodong Peninsula region, characterized by a transitional landscape between the Northeast China Plain and coastal lowlands. The city's terrain is predominantly flat to gently rolling, with an average elevation around 20-50 meters above sea level, facilitating urban sprawl and agricultural development. Linghai's proximity to the Bohai Sea—approximately 15-20 kilometers from its coastline—creates a distinctive microclimate where maritime influences moderate temperatures but also contribute to humidity and occasional sea fog. The city lies within the broader Bohai Rim economic zone, an area with significant industrial activity including manufacturing, petrochemicals, and shipping, though Linghai itself maintains a more balanced urban-rural gradient with surrounding agricultural lands producing grains and vegetables. This geographic positioning affects air quality through several mechanisms: coastal winds can disperse pollutants but also transport industrial emissions from nearby port cities like Jinzhou and Huludao; the flat terrain lacks natural barriers to pollutant dispersion; and the urban-rural interface means both vehicular emissions from the city center and agricultural burning in peripheral areas contribute to particulate matter. The city's location in East Asia's temperate monsoon belt further subjects it to seasonal wind patterns that alternately bring cleaner maritime air or stagnant continental conditions.

Linghai's air quality follows a distinct seasonal pattern shaped by its temperate monsoon climate and geographic setting. During winter (December-February), pollution typically peaks due to a combination of factors: increased coal burning for heating, frequent temperature inversions that trap pollutants near the ground, and prevailing northwesterly winds that carry industrial emissions from inland areas. This season presents the highest risk for sensitive groups like children, elderly, and those with respiratory conditions, who should limit prolonged outdoor exposure. Spring (March-May) brings gradual improvement as temperatures rise and winds shift, though March-April can see occasional spikes from dust storms originating in Mongolia and northern China, mixed with local agricultural burning. Summer (June-August) offers the cleanest air overall, with southeasterly monsoon winds from the Bohai Sea dispersing pollutants, higher temperatures reducing heating emissions, and frequent rainfall washing particulate matter from the atmosphere—making this the optimal season for outdoor activities. Autumn (September-November) begins with relatively good air quality in September but deteriorates through October-November as heating season commences, wind patterns transition, and atmospheric stability increases. Throughout the year, sea fog can occasionally exacerbate pollution by trapping emissions near the surface, particularly in spring and early summer. Residents should monitor local air quality indices and plan outdoor exercise for midday in summer or after rainfall events when pollutant concentrations are lowest.