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Changyŏn, nestled within the Hwangnam province of North Korea, occupies a geographically constrained position in the Korean Peninsula. Located at coordinates 38.2517°N, 125.1021°E, the city’s terrain is largely defined by rolling hills and valleys, typical of the region’s landscape. With a population of approximately 48,984, Changyŏn is a relatively small urban centre. Its proximity to the Yellow Sea, roughly 60km to the west, introduces maritime influences on local weather patterns, but also potential for salt-laden air impacting air quality. The surrounding area is predominantly agricultural, with rice paddies and small-scale farming dominating the rural landscape. While specific details regarding industrial zones within Changyŏn are limited due to data scarcity, the broader Hwangnam province contains some light industrial activity, potentially contributing to localised pollution. The urban-rural gradient is relatively sharp, transitioning quickly from the city centre to agricultural fields and forested hills. This topography can exacerbate pollution events by trapping emissions during periods of calm weather. The city’s elevation, approximately 100-200m above sea level, influences air circulation and the dispersion of pollutants. Understanding these geographical factors is crucial for assessing and mitigating air quality challenges in Changyŏn.

Air quality in Changyŏn follows a distinct seasonal pattern, heavily influenced by prevailing weather systems. Spring (March-May) often sees increased dust and particulate matter from the Gobi Desert, carried by westerly winds, impacting visibility and respiratory health. This is compounded by agricultural burning practices preparing fields for planting. Summers (June-August) bring the East Asian monsoon, offering periods of cleansing rainfall that temporarily improve air quality, but also high humidity which can trap pollutants near the ground. Autumn (September-November) is generally the clearest period, with stable high-pressure systems and cooler temperatures promoting dispersion. However, increased coal burning for heating as temperatures drop can lead to localised spikes in particulate matter. Winters (December-February) are typically the most challenging. Siberian high-pressure systems bring cold, dry air and frequent temperature inversions, trapping pollutants close to the surface. These conditions, combined with increased heating demands, result in the poorest air quality of the year. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during winter months and periods of high dust in spring. Monitoring wind direction and avoiding activity near agricultural areas during burning season is also advisable.