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Helixi is situated in southeastern Anhui province, China, at coordinates 30.6267°N, 118.9861°E, placing it within the Yangtze River Delta region—one of China's most economically dynamic and densely populated areas. The city lies in a transitional zone between the Jiangnan Hills to the south and the Yangtze Plain to the north, resulting in a varied terrain of low mountains, rolling hills, and river valleys. Elevation typically ranges from 100 to 300 meters above sea level, which can influence local air circulation patterns. Helixi is positioned near the Qingyi River, a tributary of the Yangtze, approximately 150 kilometers west of Shanghai, embedding it within a broader urban-industrial corridor that stretches along the Yangtze River. This location subjects Helixi to air quality impacts from both local urban activities and regional pollution transport. The surrounding landscape includes agricultural zones producing rice and tea, interspersed with manufacturing hubs, creating an urban–rural gradient where pollution sources blend. Proximity to major industrial belts in Anhui and Jiangsu provinces means that pollutants from factories, power plants, and transportation networks can accumulate, especially under stagnant weather conditions. The city's topography, with surrounding hills, can trap pollutants, exacerbating air quality issues during periods of low wind. This geographic setting makes Helixi vulnerable to particulate matter and ozone formation, driven by its role in East Asia's industrial heartland.

In Helixi, air quality follows a distinct seasonal pattern influenced by the East Asian monsoon and local meteorological conditions. During winter (December to February), pollution often peaks due to increased emissions from heating sources, combined with frequent temperature inversions that trap pollutants near the surface. Cold, stagnant air and low wind speeds exacerbate particulate matter accumulation, making this season particularly challenging for outdoor activities. Sensitive groups, such as those with respiratory conditions, should limit exposure and use air purifiers indoors. Spring (March to May) brings gradual improvement as temperatures rise and monsoon winds begin to disperse pollutants, though occasional dust storms from northern China can cause temporary spikes. Summer (June to August) sees the lowest pollution levels due to strong southerly monsoon winds, higher humidity, and convective rainfall that scrub the air, favouring outdoor pursuits. However, high temperatures can increase ozone formation on sunny days, requiring caution during afternoon hours. Autumn (September to November) marks a transition, with pollution rising again as winds weaken and atmospheric stability increases, leading to haze episodes. Fog and mist in late autumn can further reduce visibility and air quality. For health guidance, plan outdoor activities in summer and early autumn, avoid strenuous exercise on calm winter days, and monitor local air quality reports year-round to mitigate risks.