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Cheb, nestled in the western Czech Republic within the Karlovarský Kraj, occupies a geographically significant position at the confluence of the Ohře and Teplá rivers. Its coordinates (50.0794, 12.3706) place it within the foothills of the Šumava Mountains, a landscape characterized by rolling hills, dense forests, and a gradual urban–rural gradient. The city’s terrain is gently undulating, with the rivers carving a valley that influences local microclimates and drainage patterns. Historically, Cheb’s location on trade routes contributed to its urban development, resulting in a compact, medieval core surrounded by more modern residential areas. The surrounding landscape is predominantly agricultural, with fields and pastures extending towards the Šumava National Park, a vital green lung for the region. While Cheb itself isn't situated directly within a major industrial belt, it lies within a region with a history of mining and light industry, and is relatively close to industrial areas in Bavaria, Germany, impacting potential transboundary pollution. The elevation, averaging around 430 meters above sea level, can contribute to temperature inversions during colder months, trapping pollutants near the ground. The proximity to the Ohře River, while providing a scenic backdrop and water resources, can also exacerbate localized pollution episodes, particularly during periods of low flow. The urban fabric is relatively compact, limiting dispersion of pollutants, and the surrounding forests offer some natural filtration, though their effectiveness is dependent on meteorological conditions.

Cheb’s air quality experiences a distinct seasonal cycle heavily influenced by meteorological patterns. Winter months (December-February) often present the greatest challenges. Cold, stable air masses frequently lead to temperature inversions, where a layer of warm air sits above cooler air near the ground, preventing vertical mixing and trapping pollutants. Fog, common during this period, further reduces dispersion. Heating systems, reliant on solid fuels in some households, contribute significantly to particulate matter pollution. Spring (March-May) brings a gradual improvement as temperatures rise and wind speeds increase, dispersing pollutants more effectively. However, agricultural activities, such as fertilizer application, can temporarily elevate ammonia levels. Summer (June-August) generally offers the best air quality, with frequent convective mixing and occasional rainfall cleansing the atmosphere. However, hot, still days can still lead to localized ozone formation. Autumn (September-November) sees a transition period, with decreasing temperatures and increasing humidity. Biomass burning, both agricultural and residential, can contribute to elevated particulate matter levels. The best time for outdoor activities is typically during the summer months, particularly in the mornings before the build-up of ozone. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during winter inversions and avoid strenuous outdoor activity on days with poor visibility. Awareness of local weather forecasts and air quality reports is crucial for informed decision-making regarding outdoor exposure.