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Huazhou is a county-level city in southwestern Guangdong province, situated within the Leizhou Peninsula region of China's southern coast. Its coordinates at 21.6640°N, 110.6396°E place it in a subtropical coastal plain environment characterized by low-lying terrain with average elevations under 50 meters, creating conditions where air pollutants can accumulate rather than disperse through elevation changes. The city lies approximately 30 kilometers inland from the South China Sea coast, with the Jian River flowing through its territory—this proximity to water bodies provides some moderating influence on pollution through sea breezes, though limited by the city's inland position. Huazhou occupies a transitional zone between Guangdong's densely populated Pearl River Delta industrial belt to the northeast and the more agricultural Leizhou Peninsula to the southwest, resulting in mixed pollution sources from both urban development and regional farming activities. The urban-rural gradient shows concentrated development in Huazhou's central urban area surrounded by expanding suburban zones and agricultural lands, particularly for tropical fruit cultivation. Surrounding landscapes include low hills to the north and west, with flat plains dominating the eastern and southern approaches toward the coast. This geography creates a semi-enclosed basin effect where pollutants from local traffic, residential heating (minimal due to climate), small-scale industry, and agricultural burning can become trapped under certain meteorological conditions, especially when combined with regional transport from the more industrialized areas of western Guangdong.

Huazhou's air quality follows distinct seasonal patterns driven by the East Asian monsoon system and local meteorological conditions. During winter (December-February), cooler temperatures and frequent temperature inversions create stable atmospheric conditions that trap pollutants near the surface, making this the period of generally poorest air quality—particularly in January when domestic heating (though minimal) combines with increased energy consumption and occasional agricultural residue burning. Spring (March-May) brings transitional conditions with increasing rainfall from the pre-monsoon period, which helps wash pollutants from the air, though occasional haze episodes can occur during dry spells. The summer monsoon (June-August) delivers the cleanest air as strong southerly and southeasterly winds from the South China Sea vigorously ventilate the region, with frequent afternoon thunderstorms providing additional cleansing through wet deposition—this is the optimal season for outdoor activities. Autumn (September-November) sees gradually deteriorating conditions as monsoon winds weaken and temperatures begin to drop, with October often experiencing a secondary pollution peak due to reduced dispersion and possible biomass burning from agricultural activities. Sensitive groups including those with respiratory conditions, children, and the elderly should limit prolonged outdoor exertion during winter months and on days with visible haze or stagnant conditions, while summer generally presents minimal air quality concerns. The city's coastal proximity provides some mitigation through sea breezes, but these effects diminish during periods of regional-scale pollution buildup.