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Jiaji, situated in Hainan Province's Qionghai City, occupies a distinctive position on China's tropical island of Hainan, nestled along the eastern coast facing the South China Sea. This urban center, with a population exceeding 500,000, lies approximately 80 kilometers southeast of Haikou, the provincial capital, positioning it within Hainan's eastern development corridor. The terrain here is predominantly flat coastal plain, with elevations rarely exceeding 50 meters above sea level, allowing for unobstructed air movement from the ocean. Jiaji's immediate surroundings blend urban development with agricultural zones—primarily rubber plantations, tropical fruit orchards, and rice paddies—creating an urban-rural gradient that influences local air quality. Proximity to the South China Sea provides natural ventilation, with prevailing easterly winds typically dispersing pollutants effectively. However, the city's location within Hainan's relatively industrialized eastern belt, combined with increasing vehicular emissions from its growing population and occasional agricultural burning in surrounding rural areas, introduces particulate matter and gaseous pollutants. The absence of significant mountain ranges to trap pollution is advantageous, though the flat topography can occasionally allow pollutants from regional sources to accumulate during stagnant weather conditions. Jiaji's coastal setting generally promotes better air quality than inland Chinese cities, but urban expansion and tourism development present ongoing challenges for maintaining this advantage.

Jiaji's air quality follows distinct seasonal patterns shaped by Hainan's tropical monsoon climate, with pollution levels generally lower than mainland Chinese cities but showing noticeable variations throughout the year. During winter (December-February), cooler temperatures and reduced rainfall can lead to occasional accumulation of particulate matter from local sources like vehicle emissions and construction dust, particularly during periods of light winds. Spring (March-May) sees improving conditions as increased rainfall and strengthening southeasterly winds from the South China Sea help disperse pollutants, making this an excellent time for outdoor activities. Summer (June-August) brings the southwest monsoon with frequent heavy rains that effectively wash pollutants from the atmosphere, resulting in consistently good air quality despite higher humidity that can sometimes trap pollutants near the ground temporarily. Autumn (September-November) transitions to drier conditions with variable winds, potentially allowing localized pollution from agricultural burning or urban activities to persist longer. Sensitive groups—including those with respiratory conditions, children, and the elderly—should monitor air quality reports during winter and autumn when pollution may peak, limiting prolonged outdoor exertion on days with visible haze or stagnant air. Generally, Jiaji's coastal breezes and tropical climate maintain relatively favorable air quality year-round compared to heavily industrialized regions, with spring and summer offering the most reliably clean conditions for outdoor pursuits.