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Ulanqab (Ulan Hua), situated in the southwestern expanse of Inner Mongolia, China, occupies a geographically significant position within the Ordos Basin. Its coordinates (41.5300, 111.7000) place it on a vast, relatively flat plateau, averaging around 1,400 meters above sea level. The surrounding landscape is dominated by expansive grasslands and semi-arid steppe, transitioning to desert fringes further west. This terrain, while visually striking, contributes to air quality challenges. The city’s location within the basin creates a natural bowl, hindering atmospheric dispersion, particularly during periods of stable weather. Ulanqab sits far from major rivers, relying on groundwater and limited surface runoff, impacting regional humidity and influencing local meteorological patterns. To the east and south, agricultural zones, primarily focused on livestock grazing and grain cultivation, contribute to dust and ammonia emissions. Westward, the landscape gradually shifts towards the Gobi Desert, a significant source of transported dust and sandstorms. The urban–rural gradient is relatively sharp, with the city’s industrial belt concentrated in the central area, surrounded by a ring of agricultural land and then the open steppe. Historically, Ulanqab has been a key coal mining and industrial hub, and this legacy continues to shape its economic profile and, consequently, its air quality. The city’s relatively isolated location, while offering some resilience, also limits access to external air masses that could naturally cleanse the atmosphere.

Ulanqab’s air quality follows a distinct seasonal pattern dictated by its continental climate and regional weather systems. Winters (November – February) are typically the most challenging, characterized by prolonged periods of temperature inversions. Cold, dense air settles in the basin, trapping pollutants near the ground and inhibiting vertical mixing. These inversions, coupled with reduced sunlight hours and limited wind speeds, lead to significant particulate matter accumulation. Dust storms originating from the Gobi Desert are also more frequent during this period. Spring (March – May) brings a gradual improvement as temperatures rise and winds increase, though dust storms remain a concern, particularly in March and April. Summer (June – August) generally sees the best air quality, driven by monsoon winds that sweep across the region, dispersing pollutants and increasing rainfall. However, occasional periods of stagnant air can still occur. Autumn (September – October) presents a transitional period, with decreasing temperatures and increasing wind speeds, but also a resurgence of dust from the northwest. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during winter months, limiting outdoor exposure and monitoring local air quality reports. During spring and autumn, awareness of dust storm forecasts is crucial. Maintaining indoor air quality through filtration and ventilation is recommended throughout the year, particularly during periods of elevated pollution. The dry climate exacerbates respiratory irritation, so adequate hydration is also important.