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Kedu, nestled within the mountainous landscapes of Guizhou Province, China, occupies a geographically significant position within the broader southwestern region. Located at approximately 25.71°N, 106.84°E and an elevation of around 1300 meters (4265 feet), the city’s terrain is characterized by steep slopes, karst formations, and dense subtropical forests. This rugged topography significantly influences local air circulation patterns, often leading to stagnant air conditions, particularly during periods of low wind speed. Kedu sits on the edge of the Wumeng Mountains, a range that acts as a barrier, trapping pollutants and moderating regional weather. The surrounding landscape is predominantly rural, comprising terraced agricultural fields – primarily rice and maize cultivation – and extensive forest cover. While Kedu itself is a relatively small urban center with a population of roughly 27,363, it’s part of a larger regional network connected by roads to larger population centers and industrial zones further east. The urban–rural gradient is sharp; the city transitions quickly into agricultural land and forested hills. The lack of major nearby rivers or lakes limits evaporative cooling and moisture, further contributing to drier air conditions, which can exacerbate particulate matter concentrations. The karst geology also impacts drainage and can influence local humidity levels. The region's geological composition, combined with the mountainous terrain, creates a microclimate that can amplify the effects of pollution sources, both local and regional.

Kedu’s air quality experiences a distinct seasonal cycle heavily influenced by its subtropical monsoon climate and mountainous geography. The dry season, typically spanning from October through April, presents the most significant air quality challenges. During these months, reduced rainfall, lower humidity, and frequent temperature inversions trap pollutants close to the ground. Temperature inversions, where a layer of warm air sits above cooler air, prevent vertical mixing and allow pollutants to accumulate. Agricultural burning, a common practice in the surrounding rural areas for land clearing and crop residue disposal, contributes significantly to particulate matter pollution during this period, particularly in November and December. The monsoon season, from May to September, brings increased rainfall and higher humidity, naturally cleansing the air and dispersing pollutants. However, periods of heavy fog, common during the transition months (October and April), can also lead to localized air quality degradation by trapping moisture and pollutants. Wind patterns are generally variable, but during the dry season, they are often weak, further exacerbating stagnation. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, limiting outdoor activities on days with visibly hazy conditions. The spring months (March-April) can see a gradual improvement as rainfall increases, but agricultural burning may still occur. The summer months (June-August) generally offer the best air quality, although occasional heavy rainfall events can temporarily disrupt this.