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Leizhou is a coastal city located on the Leizhou Peninsula in southwestern Guangdong Province, China, positioned at the southernmost tip of mainland China's coastline where the South China Sea meets the Beibu Gulf. This strategic maritime location creates a unique urban character blending port activities with agricultural hinterlands, as the city serves as a regional hub for the peninsula's extensive farming communities. The terrain is predominantly low-lying coastal plains with gentle hills, averaging just 20-50 meters above sea level, which significantly influences air quality through limited natural ventilation. Surrounded by the South China Sea to the east and Beibu Gulf to the west, Leizhou's air quality benefits from sea breezes that disperse pollutants, though this effect is moderated by the peninsula's topography that can trap emissions. The region forms part of Guangdong's western agricultural belt, with vast sugarcane, tropical fruit, and rubber plantations that contribute biogenic emissions, while urban areas generate pollution from transportation, residential heating, and small-scale industries. The urban-rural gradient shows concentrated pollution in Leizhou's central districts, gradually dissipating toward rural agricultural zones and coastal fishing villages. Proximity to major shipping lanes in the Qiongzhou Strait adds maritime emissions, while distance from Guangdong's Pearl River Delta industrial heartland provides some protection from regional pollution transport, making local sources more dominant in air quality patterns.

Leizhou's air quality follows distinct seasonal patterns shaped by the East Asian monsoon system and tropical maritime climate. During winter (December-February), cooler temperatures and stable atmospheric conditions, combined with occasional temperature inversions, can trap pollutants near the surface, leading to moderate pollution episodes despite lower emission rates; sensitive groups should limit prolonged outdoor exposure on calm mornings. Spring (March-May) brings transitional weather with increasing rainfall from the pre-monsoon period, which helps wash out particulate matter, though occasional fog and haze from agricultural burning in surrounding rural areas can cause short-term spikes. Summer (June-August) offers the cleanest air as the strong southwest monsoon brings consistent sea breezes, frequent thunderstorms, and high precipitation that effectively scavenge pollutants, making this the optimal season for outdoor activities. Autumn (September-November) sees gradually deteriorating conditions as monsoon winds weaken, humidity drops, and temperature inversions become more common, with October-November potentially experiencing the year's worst pollution due to stagnant air and increased biomass burning. Throughout the year, sea breezes provide natural ventilation, but their effectiveness diminishes during monsoon transitions. Sensitive individuals should monitor local air quality forecasts particularly during late autumn and winter, using morning hours for outdoor activities when pollution dispersion is better, and avoiding strenuous exercise during pollution episodes that often coincide with foggy conditions.