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Xingcheng, situated in Guangdong Province's northeastern region at coordinates 24.1347°N, 115.7300°E, occupies a distinctive position within China's Pearl River Delta economic zone while maintaining its own geographic character. The city lies approximately 200 kilometers northeast of Guangzhou, positioned in the transitional zone between the coastal plains of southern Guangdong and the mountainous interior of northern Guangdong and Jiangxi provinces. This location places Xingcheng at the confluence of several geographic influences that significantly impact its air quality patterns. The terrain surrounding Xingcheng features rolling hills and low mountains, with the city itself situated at moderate elevation that provides some natural ventilation compared to completely flat urban areas. Proximity to the Dongjiang River system creates both benefits and challenges—while water bodies can help disperse pollutants, they also contribute to humidity that can trap particulate matter during certain conditions. Xingcheng exists within Guangdong's industrial belt, with manufacturing facilities and urban development creating typical urban pollution sources, yet it also borders agricultural zones that contribute biomass burning emissions during harvest seasons. The urban-rural gradient shows a concentrated urban core surrounded by gradually less dense development, creating a pollution plume that extends downwind according to prevailing wind patterns. This geographic positioning means Xingcheng receives air masses from multiple directions—marine air from the South China Sea, continental air from inland China, and regional pollution transported from the Pearl River Delta megacities—creating complex air quality dynamics influenced by both local emissions and regional transport.

Xingcheng's air quality follows a distinct seasonal rhythm shaped by East Asian monsoon patterns and local meteorological conditions. During winter (December-February), northeasterly monsoon winds transport continental air masses from northern China, often carrying pollutants accumulated over industrial regions, while temperature inversions become more frequent in the cooler, stable atmospheric conditions, trapping emissions near the surface. This combination typically creates the year's poorest air quality, with sensitive groups advised to limit prolonged outdoor exposure during these months. Spring (March-May) brings transitional weather with increasing rainfall that helps cleanse the atmosphere, though occasional dust events from northern China can temporarily degrade air quality. The summer monsoon (June-August) arrives with southeasterly winds from the South China Sea, bringing cleaner marine air that significantly improves air quality, making this the most favorable season for outdoor activities despite high humidity that can occasionally create hazy conditions. Autumn (September-November) features generally good air quality as monsoon transitions create breezy conditions, though agricultural burning in surrounding regions can cause episodic pollution spikes. Throughout the year, fog formation in the river valleys can temporarily worsen pollution visibility and concentration. Sensitive individuals—including those with respiratory conditions, children, and elderly residents—should monitor daily conditions closely during winter inversion periods and consider indoor air filtration during peak pollution episodes, while generally finding summer and early autumn most suitable for outdoor exercise and activities.