Jinjiang Air Quality Index (AQI)

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Jinjiang, a coastal city in Hainan Province, China, occupies a strategic position on the northern coast of the island, at coordinates 19.7288°N, 110.0085°E. With a population of approximately 142,948, Jinjiang’s geography is defined by its proximity to the Qiongzhou Strait, separating Hainan from Guangdong province. The terrain is generally flat, typical of coastal plains, with a gradual rise inland towards the central mountainous spine of Hainan Island. This flatness contributes to limited natural dispersion of pollutants. The city benefits from a tropical monsoon climate, heavily influenced by maritime air masses. Surrounding Jinjiang are extensive agricultural lands, primarily focused on rubber and tropical fruit cultivation, alongside developing industrial zones concentrated around the port areas. These industries, while driving economic growth, contribute to localised emissions. The urban-rural gradient is relatively sharp, transitioning quickly from denser city centres to agricultural landscapes. The coastal location means frequent sea breezes, which can both dilute and transport pollutants, depending on prevailing wind directions and atmospheric stability. The city’s location within a broader industrial belt along the southern Chinese coast means it’s susceptible to regional transport of pollutants from more heavily industrialised areas.

Jinjiang’s air quality follows a distinct seasonal pattern dictated by the tropical monsoon climate. The dry season, roughly from November to April, often sees poorer air quality. During these months, weaker winds and increased atmospheric stability lead to pollutant build-up, particularly from local industrial activity and agricultural burning. Temperature inversions, common during the cooler, drier periods, trap pollutants near the ground. February and March are typically the months with the least atmospheric mixing. The wet season, spanning May to October, generally brings improved air quality. The monsoon rains effectively wash pollutants from the atmosphere, and increased humidity promotes particle deposition. However, intense rainfall can also lead to localised flooding and the spread of waterborne contaminants. August and September, peak monsoon months, usually offer the cleanest air. Sensitive groups – children, the elderly, and those with respiratory conditions – should exercise caution during the dry season, limiting strenuous outdoor activity on still days. Monitoring wind direction is crucial; onshore winds can bring pollutants from the mainland. Fog, common in the transitional seasons, can exacerbate respiratory issues by trapping pollutants at ground level.