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Hương Canh, nestled within Vĩnh Phúc province in northern Vietnam, occupies a geographically significant position in the Red River Delta. Located at coordinates 21.2833°N, 105.6500°E, the city’s terrain is characterised by a relatively flat alluvial plain, typical of deltaic environments. This low-lying landscape, with an elevation generally below 50 meters, is interwoven with a network of canals and small rivers feeding into the larger Red River system. The surrounding landscape is predominantly agricultural, dominated by rice paddies, interspersed with pockets of fruit orchards and aquaculture ponds. Vĩnh Phúc province is increasingly becoming an industrial hub, and Hương Canh’s proximity to larger industrial zones in nearby cities like Vĩnh Yên contributes to regional air quality dynamics. The urban-rural gradient is pronounced; the city centre exhibits denser development, while the periphery quickly transitions into rural farmland. This proximity to both agricultural practices (potential for ammonia emissions from fertilizers and burning of agricultural waste) and industrial activity creates a complex interplay of pollution sources. The prevailing winds, influenced by the monsoon patterns, play a crucial role in dispersing or concentrating pollutants within the valley. The flat terrain can also exacerbate the impact of temperature inversions, trapping pollutants near the ground.

Hương Canh experiences a humid subtropical climate, with distinct wet and dry seasons heavily influencing air quality. The dry season, spanning November to April, typically sees poorer air quality. Cooler temperatures during these months can lead to temperature inversions, trapping pollutants emitted from local industries and household burning of biomass for heating. January and February are often the most stagnant months, with minimal wind dispersal. The onset of the wet season in May brings relief, as monsoon rains effectively wash pollutants from the atmosphere. However, increased humidity can also promote the formation of secondary pollutants. June to August sees the heaviest rainfall, generally resulting in the cleanest air. September and October represent a transitional period, with decreasing rainfall and a gradual return to drier conditions, and a corresponding increase in particulate matter. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during the dry season, particularly in January and February. During the wet season, while air quality is generally better, mould spores can become prevalent, potentially triggering allergic reactions. Monitoring local weather patterns and avoiding peak traffic hours are advisable year-round.