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Jingcheng, situated in Jiangsu Province's central region along China's eastern coast, occupies a strategic position within the Yangtze River Delta economic powerhouse. The city lies approximately 100 kilometers northwest of Shanghai and 200 kilometers east of Nanjing, placing it firmly within one of China's most industrialized and densely populated urban corridors. Jingcheng's terrain is predominantly flat alluvial plain, typical of the Jiangnan region, with an average elevation of just 4-5 meters above sea level—this low-lying topography significantly impedes natural air circulation and pollutant dispersion. The city is intersected by the Grand Canal and sits near the confluence of the Yangtze River and Yellow Sea, yet this proximity to water bodies provides only limited moderating effects on air quality due to the overwhelming influence of regional pollution sources. Jingcheng exists within a pronounced urban-rural gradient, transitioning from dense urban cores to peri-urban industrial zones and then to intensive agricultural lands, creating complex pollution mixtures. The surrounding landscape features rice paddies, aquaculture ponds, and light manufacturing clusters that contribute both agricultural burning emissions and industrial pollutants. Its location within the Yangtze River Delta Industrial Belt means Jingcheng experiences transboundary pollution from Shanghai, Suzhou, and Wuxi, while local emissions from its own manufacturing, construction, and transportation sectors compound air quality challenges. The flat terrain prevents orographic lifting that might otherwise help disperse pollutants, creating conditions conducive to pollution accumulation, particularly during stable atmospheric conditions.

Jingcheng's air quality follows distinct seasonal patterns shaped by East Asian monsoons and regional meteorological conditions. During winter (December-February), cold, dry northerly winds from Siberia transport pollutants from northern industrial regions while local heating demands increase emissions. Temperature inversions frequently trap pollutants near the surface, creating persistent haze episodes—January typically sees the worst conditions, making outdoor exercise inadvisable for sensitive groups like asthmatics and elderly residents. Spring (March-May) brings transitional weather with variable winds that sometimes improve air quality, though agricultural burning in surrounding regions can cause sudden pollution spikes in April. The plum rain season in early summer (June) increases humidity and precipitation that temporarily scrub pollutants from the air, offering relatively better conditions for outdoor activities. Summer (July-August) features southeasterly monsoon winds from the Pacific that bring cleaner maritime air, though high temperatures and sunlight can trigger ozone formation on hot afternoons. Autumn (September-November) begins with decent air quality in September but deteriorates through October and November as winds shift, atmospheric stability increases, and agricultural residue burning resumes. Sensitive groups should monitor daily forecasts year-round, prioritize indoor activities during pollution episodes, and consider wearing N95 masks when AQI exceeds 150. The most favorable months for outdoor activities are typically June and September, while January and November generally present the greatest respiratory health risks.