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Beihai, situated on the northeastern coast of the Beibu Gulf in Guangxi, China, occupies a strategic position at the southernmost tip of the country's mainland, bordering the South China Sea. This coastal city, with coordinates 21.4810°N, 109.1200°E, lies on a low-lying coastal plain, averaging just 10-20 meters above sea level, which significantly influences its air quality dynamics. The urban core, home to 1.68 million residents, blends modern development with historical port functions, creating a mixed urban-rural gradient that extends inland toward agricultural zones and small-scale industrial areas. Surrounding landscapes include the Leizhou Peninsula to the east and the Gulf of Tonkin to the south, with the city's proximity to these large bodies of water fostering sea breezes that typically disperse pollutants. However, Beihai's location within the Pearl River Delta's extended economic sphere means it experiences some industrial emissions from regional manufacturing and shipping activities, though less intensively than major metropolises like Guangzhou. The terrain is generally flat with gentle hills to the north, limiting natural barriers that might trap pollution, while its coastal setting exposes it to maritime influences that can both cleanse and, at times, contribute to haze formation under specific weather conditions. This geographic context positions Beihai as a transitional zone between industrial inland areas and cleaner oceanic air, resulting in moderate pollution levels influenced by both urban activities and natural ventilation from the sea.

In Beihai, air quality follows a distinct seasonal pattern shaped by the East Asian monsoon system and local meteorological factors. During winter (December to February), cooler temperatures and stable atmospheric conditions can lead to occasional temperature inversions, trapping pollutants near the surface, especially from urban heating and transportation; this period may see modest pollution peaks, making late mornings preferable for outdoor activities. Spring (March to May) brings increasing humidity and the onset of the southwest monsoon, with frequent sea breezes dispersing pollutants effectively, though occasional fog can temporarily elevate particulate levels—sensitive groups should monitor forecasts on hazy days. Summer (June to August) is characterized by the full force of the monsoon, with heavy rainfall and strong winds from the South China Sea that thoroughly cleanse the air, resulting in the year's cleanest conditions ideal for all outdoor pursuits. Autumn (September to November) transitions to drier weather with reduced wind speeds, allowing pollutants from agricultural burning in surrounding rural areas to accumulate at times, particularly in October; this season requires caution for those with respiratory issues during calm, sunny afternoons. Throughout the year, Beihai's coastal location mitigates severe pollution episodes, but sensitive individuals should avoid prolonged exposure during stagnant winter mornings and autumn haze events, favoring the breezy summer months for optimal air quality and health.