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Taizhou, Zhejiang, occupies a strategic position on China's eastern coast where the Jiaojiang River meets the East China Sea, creating a distinctive urban geography that profoundly influences its air quality. Situated in the Yangtze River Delta economic zone—one of China's most industrialized regions—the city spreads across a varied terrain of coastal plains, low hills, and river valleys, with elevations generally below 500 meters. This topography, combined with its proximity to the ocean, creates a natural ventilation corridor that can disperse pollutants, but also traps emissions under certain meteorological conditions. Taizhou's urban core is densely populated and surrounded by expanding industrial belts, particularly in sectors like manufacturing, chemicals, and textiles, which contribute significantly to local pollution sources. The city's location between the fertile agricultural zones of the Zhejiang interior and the busy coastal shipping lanes adds a mix of agricultural burning and maritime emissions to its air quality challenges. An urban–rural gradient exists, with cleaner air in the southern mountainous areas and higher pollution in the northern industrial districts near the coast. The surrounding landscape, including the Yandang Mountains to the west, can act as a barrier to pollutant dispersion, especially during stagnant weather patterns, making Taizhou's air quality a complex interplay of natural advantages and human-induced pressures.

In Taizhou, air quality follows a distinct seasonal rhythm shaped by the East Asian monsoon and local meteorological patterns. During winter, from December to February, pollution often peaks due to increased coal burning for heating, industrial emissions, and frequent temperature inversions that trap pollutants near the ground, exacerbated by calm winds and fog. Sensitive groups, such as those with respiratory conditions, should limit outdoor activities during these months, especially on cold, still mornings. Spring, from March to May, brings variable conditions: early spring can see lingering pollution from winter, but as the monsoon shifts, increased rainfall and stronger southeasterly winds from the ocean help cleanse the air, making late spring more favourable for outdoor pursuits. Summer, from June to August, typically offers the best air quality, with dominant sea breezes, higher temperatures promoting vertical mixing, and frequent typhoons that flush out pollutants, though occasional heatwaves can lead to ozone formation. Autumn, from September to November, sees a gradual deterioration as winds weaken, humidity rises, and agricultural burning in surrounding areas may contribute to haze, particularly in October and November. Residents should monitor local forecasts and plan activities for summer or late spring to minimize exposure, while vulnerable individuals should use air purifiers indoors during high-pollution episodes.