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Jianshe, situated in central Henan Province at coordinates 34.2137°N, 113.7629°E, occupies a strategic position within China's densely populated North China Plain. This urban center lies approximately 80 kilometers southwest of Zhengzhou, the provincial capital, placing it within the broader Central Plains economic region known for its manufacturing and agricultural output. The city's terrain is predominantly flat, with an average elevation around 100 meters above sea level, characteristic of the alluvial plain formed by the Yellow River basin. Jianshe's location exposes it to air quality challenges typical of inland Chinese cities, as it sits within an industrial corridor extending from Zhengzhou to Luoyang, where manufacturing facilities, power plants, and transportation networks contribute to regional pollution. The urban-rural gradient shows concentrated development in the city core transitioning to agricultural lands dominated by wheat and corn cultivation in surrounding areas. While no major rivers flow directly through the city, it lies within the broader Hai River watershed, with seasonal water bodies influencing local humidity patterns. The absence of significant topographic barriers allows pollutants to accumulate during stagnant atmospheric conditions, while the city's position away from coastal cleansing winds exacerbates particulate matter retention. Surrounding agricultural activities contribute ammonia emissions that interact with industrial and vehicular pollutants to form secondary particulate matter, creating complex pollution chemistry influenced by the region's continental climate.

Jianshe experiences distinct seasonal air quality patterns shaped by its continental monsoon climate. During winter (December-February), pollution typically peaks due to coal-fired heating systems operating across residential and industrial sectors, combined with frequent temperature inversions that trap pollutants near the surface. Cold, stagnant air masses from Siberia create atmospheric stability, while low wind speeds prevent dispersion—making January the most challenging month for air quality. Sensitive groups should limit prolonged outdoor exposure during this period. Spring (March-May) brings gradual improvement as heating demands decrease and increasing wind speeds from Mongolian high-pressure systems help disperse pollutants, though March can still experience poor air quality from lingering winter conditions and occasional dust storms from the Loess Plateau. Summer (June-August) offers the cleanest air as monsoon rains from the southeast wash pollutants from the atmosphere, while higher temperatures promote vertical mixing. However, high humidity can occasionally lead to haze formation. Autumn (September-November) sees a gradual deterioration as heating systems restart and atmospheric stability increases, with October-November often showing worsening conditions before winter's peak. The optimal months for outdoor activities are typically June through September, when meteorological conditions favor better air quality. Residents with respiratory conditions should monitor daily air quality forecasts year-round and consider indoor air purifiers during pollution episodes.