Shengli Air Quality Index (AQI)

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Shengli, located in the Ningxia Hui Autonomous Region of China, occupies a geographically significant position within the Loess Plateau. Situated at approximately 37.98°N, 106.19°E, and an elevation of around 1,450 meters (4,757 feet) above sea level, the city’s terrain is characterized by undulating hills and expansive plains, typical of the region's semi-arid climate. The surrounding landscape is dominated by agricultural land, primarily wheat and corn cultivation, interspersed with sparse grasslands and scrub vegetation. Shengli’s proximity to the Yellow River, though not directly adjacent, influences regional weather patterns and contributes to localized humidity. The city’s urban footprint is relatively small, reflecting its status as a minor industrial and agricultural hub. It exhibits a distinct urban–rural gradient, with the built environment concentrated in the central area, gradually transitioning to agricultural fields and scattered rural settlements. The region’s industrial activity, while not as extensive as in coastal provinces, includes coal mining and processing, as well as some light manufacturing, contributing to localized pollution sources. The prevailing westerly winds, characteristic of the Loess Plateau, play a crucial role in dispersing pollutants, but can also transport them from upwind industrial areas. Topographically, the surrounding hills can create localized areas of stagnant air, particularly during periods of calm weather, exacerbating air quality issues. The overall geographic setting presents a complex interplay of factors influencing air quality, from agricultural practices to regional industrial emissions and meteorological conditions.

Shengli’s air quality experiences a distinct seasonal cycle heavily influenced by its continental climate and regional weather patterns. Winters (November to February) are typically the most challenging period, marked by frequent temperature inversions. Cold air settles in the valleys, trapping pollutants near the ground and leading to periods of reduced visibility and elevated particulate matter. The lack of strong winds during these months further compounds the problem. Spring (March to May) brings a gradual improvement as temperatures rise and winds increase, dispersing accumulated pollutants. However, dust storms originating from the Gobi Desert frequently impact the region, significantly degrading air quality during March and April. Summer (June to August) generally sees the best air quality due to increased rainfall, which helps to wash pollutants from the atmosphere, and stronger winds that facilitate dispersion. The monsoon season brings periods of heavy rain, temporarily improving conditions. Autumn (September to October) is a transitional period, with air quality gradually deteriorating as temperatures cool and the likelihood of temperature inversions increases. October, in particular, can experience stagnant air conditions. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during winter and spring, limiting outdoor activities on days with poor visibility. During dust storm events, wearing a high-quality mask is recommended. Maintaining indoor air quality through ventilation and air purification can also mitigate exposure during periods of elevated pollution.