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Taastrup, nestled within the Hovedstaden region of Denmark, occupies a geographically advantageous position just west of Copenhagen, forming part of the wider Copenhagen metropolitan area. Its coordinates (55.6475, 12.3120) place it on relatively flat terrain, characteristic of Zealand (Sjælland), Denmark’s largest island. The landscape surrounding Taastrup is a blend of agricultural fields and increasingly suburban development, reflecting a gradual urban–rural gradient as one moves further from the capital. While not directly bordering a major body of water, Taastrup benefits from proximity to Roskilde Fjord, approximately 15 kilometers to the northwest, which can influence local weather patterns and, to a lesser extent, air circulation. The elevation is generally low, rarely exceeding 50 meters above sea level, minimizing topographic influences on air flow. Historically, the area was primarily agricultural, but the expansion of Copenhagen has led to significant residential and light industrial development, though large-scale heavy industry is absent. This shift has altered the local landscape, introducing new sources of potential air pollutants, primarily from vehicle traffic and domestic heating. The prevailing westerly winds, common in Denmark, generally carry pollutants eastward, but local conditions can create pockets of stagnation, particularly during periods of stable atmospheric conditions. The city’s location within a densely populated region means it is susceptible to transboundary pollution from Copenhagen and surrounding areas, impacting overall air quality.

Taastrup’s air quality exhibits a distinct seasonal pattern dictated by Denmark’s temperate maritime climate. Winter months (November to March) often present the greatest challenges. Cold temperatures lead to increased reliance on wood-burning stoves and central heating systems, contributing to elevated levels of particulate matter, particularly fine particles (PM2.5). Temperature inversions, where a layer of warm air traps cooler air near the ground, are more frequent during this period, hindering pollutant dispersion and exacerbating local concentrations. Fog, common in winter, further reduces visibility and traps pollutants. Spring (April to May) brings a gradual improvement as temperatures rise and heating demand decreases. However, pollen levels increase significantly, impacting individuals with allergies and respiratory sensitivities. Summer (June to August) typically offers the best air quality, with warmer temperatures promoting atmospheric mixing and frequent breezes dispersing pollutants. Agricultural activities, such as fertilizer application, can occasionally contribute to ammonia emissions. Autumn (September to October) sees a transitional period, with a return of cooler temperatures and increased heating demand, though generally less severe than winter. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during winter months, limiting outdoor activity on days with stagnant air or visible fog. Spring requires awareness of pollen counts. While Taastrup generally enjoys good air quality, awareness of these seasonal variations is crucial for protecting public health.