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Rychnov nad Kněžnou, nestled within the Královéhradecký Kraj of the Czech Republic, occupies a distinctive geographical position in the Orlické podhůří foothills. The city sits at an elevation of approximately 280 meters above sea level, influencing local air circulation patterns. The surrounding landscape is characterised by rolling hills and mixed forests, typical of the Bohemian-Moravian Highlands. The Kněžná River flows nearby, providing a local hydrological feature, but doesn’t exert a dominant influence on regional air dispersal. Historically, the area was heavily agricultural, and while modern farming continues, it’s less intensive than in some other regions of the Czech Republic. Rychnov isn’t situated directly within a major industrial belt, but benefits from transport links, meaning some through-traffic contributes to localised emissions. The urban-rural gradient is relatively sharp; the city itself is compact, quickly giving way to open countryside. This proximity to rural areas can sometimes lead to the trapping of pollutants during stable atmospheric conditions, particularly during temperature inversions. The terrain, while not mountainous, creates microclimates that affect pollutant dispersion, with valleys potentially experiencing higher concentrations. The city’s location, shielded by the hills, can limit the flushing of pollutants by prevailing winds.

Air quality in Rychnov nad Kněžnou exhibits a clear seasonal rhythm. Winter, from November to February, typically sees the poorest air quality. This is largely due to increased residential heating using solid fuels – coal and wood – common in the region. Stable, cold air masses and frequent temperature inversions trap pollutants near the ground, exacerbating the problem. Fog, common during these months, further reduces visibility and concentrates particulate matter. Spring, from March to May, brings gradual improvement as heating demand decreases and winds become more frequent. However, agricultural activities, such as field preparation and fertilisation, can contribute to ammonia emissions. Summer, June to August, generally offers the best air quality, with warm temperatures promoting dispersion and minimal heating. However, occasional heatwaves can lead to increased ozone formation. Autumn, September to October, sees a return to poorer conditions as heating begins again, and the decaying vegetation adds to particulate matter. Sensitive individuals – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during winter and autumn months. Monitoring pollen levels is also advisable during spring and summer.