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Valašské Meziříčí, nestled within the picturesque Zlínský Kraj region of the Czech Republic, occupies a geographically significant position at the confluence of the Vsetínská and Rožnovská Becva rivers. Its coordinates (49.4717, 17.9711) place it within the Moravian-Silesian Highland, a landscape characterized by rolling hills, dense forests, and a generally undulating terrain. The city’s elevation, averaging around 330 meters above sea level, contributes to localized microclimates and can influence air circulation patterns. Surrounded by the Beskydy Mountains to the east and the White Carpathian Mountains to the south, Valašské Meziříčí benefits from a relatively rural setting, though it serves as a regional hub for trade and services. This urban–rural gradient means agricultural activities in the surrounding valleys, particularly livestock farming and crop cultivation, can contribute to seasonal emissions. The proximity to the Vsetínská and Rožnovská Becva rivers, while providing scenic beauty and water resources, can also lead to localized humidity and fog formation, impacting pollutant dispersion. Historically, the area has seen some light industrial activity, primarily related to woodworking and textile production, though these are less prevalent now. The prevailing westerly winds, typical of this region, generally carry air masses from the plains towards the mountains, potentially concentrating pollutants within the valley where the city resides, especially during periods of stable atmospheric conditions. The surrounding forested areas, however, do offer some natural air purification capacity.

Valašské Meziříčí’s air quality experiences a distinct seasonal cycle heavily influenced by meteorological conditions. Winter months (December-February) often present the greatest challenges. Cold temperatures and frequent temperature inversions trap pollutants near the ground, leading to increased concentrations of particulate matter and other emissions. Fog, common during these months due to the riverine humidity and cold air, further exacerbates this issue by limiting dispersion. Spring (March-May) brings a gradual improvement as temperatures rise and wind speeds increase, helping to ventilate the valley. Agricultural activities, such as fertilizer application, can contribute to ammonia emissions during this period. Summer (June-August) generally offers the best air quality, with warm temperatures, frequent rainfall, and robust winds promoting pollutant dispersal. However, occasional heatwaves can lead to stagnant air and elevated ozone levels. Autumn (September-November) sees a transition period, with cooler temperatures and increased rainfall initially improving air quality. As the season progresses, however, the return of temperature inversions and fog can lead to a resurgence of pollution. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during winter and early spring, limiting outdoor activity on days with persistent fog or stagnant air. During the warmer months, monitoring for ozone alerts is advisable. The agricultural cycle, particularly the harvest season, can impact air quality, so awareness of local agricultural practices is beneficial.