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Pingtiancun, nestled within Guangdong Province, China (25.2225° N, 114.6252° E), is a relatively small settlement of approximately 12,955 residents. Its geography is defined by the undulating terrain typical of the southeastern Chinese coastal region, transitioning from low-lying plains to gently sloping hills. The city’s location places it within the Pearl River Delta, a crucial economic zone and one of the most densely urbanised areas globally. This proximity to major industrial hubs like Shenzhen and Guangzhou significantly influences its air quality. Pingtiancun isn’t directly on the coast, but is close enough to experience the moderating influence of the South China Sea, though this is often outweighed by regional pollution transport. Surrounding the city are extensive agricultural lands, primarily rice paddies and fruit orchards, interspersed with pockets of light industry. The urban-rural gradient is sharp, with rapid development encroaching upon previously agricultural areas. This land-use change contributes to dust and particulate matter. The Pearl River Delta’s complex topography can trap pollutants, exacerbating air quality issues, particularly during periods of calm weather. The city’s elevation is relatively low, increasing its vulnerability to humidity and fog, which can further concentrate pollutants near the ground. The regional climate is subtropical, characterised by high humidity and distinct wet and dry seasons.

Pingtiancun’s air quality follows a distinct seasonal pattern dictated by the region’s subtropical monsoon climate. The autumn and winter months (October to February) typically experience the poorest air quality. This is due to cooler temperatures leading to temperature inversions, trapping pollutants near the ground, coupled with reduced rainfall for atmospheric cleansing. Northerly winds during this period often carry pollutants from industrial centres further inland. Spring (March to May) sees a gradual improvement as temperatures rise and rainfall increases, though humidity remains high, potentially fostering secondary pollutant formation. The summer months (June to September) generally offer the best air quality, driven by the prevailing southerly monsoon winds which disperse pollutants over the South China Sea and frequent, heavy rainfall that effectively washes the atmosphere. However, high humidity can still contribute to ozone formation on sunny days. Sensitive groups – children, the elderly, and those with respiratory conditions – should be particularly cautious during the autumn and winter. Outdoor activity is best limited during prolonged periods of stagnant air in these months. Monitoring local weather reports and avoiding peak traffic hours can further mitigate exposure.