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Nybro, nestled in the province of Kalmar, Sweden, occupies a geographically significant position within the southern Swedish landscape. Located at approximately 56.75°N, 15.90°E, the town sits on the plains between the Baltic Sea coast and the inland forests, a transition zone influencing its climate and air quality. The surrounding terrain is predominantly flat, characterized by agricultural fields and interspersed with small woodlands and wetlands, typical of the Småland region. This agricultural activity, while vital to the local economy, can contribute to seasonal particulate matter from farming practices. Nybro itself is a relatively small urban centre, exhibiting a clear urban–rural gradient; the town’s influence diminishes rapidly as one moves outwards into the surrounding countryside. The town is situated near Lake Åsnen, a significant freshwater lake, which can influence local humidity and temperature, impacting atmospheric stability and pollutant dispersion. While not directly adjacent to major industrial belts, Nybro benefits from its proximity to larger regional centres like Kalmar, which can occasionally influence air quality through transported pollutants. The relatively low elevation of the area, averaging around 80 meters above sea level, minimizes the potential for topographic barriers to air flow, generally facilitating pollutant dispersal, though stagnant conditions can still occur. The Baltic Sea's influence moderates temperatures to some extent, but the prevailing westerly winds are the primary drivers of air mass movement.

Nybro’s air quality experiences a distinct seasonal cycle dictated by meteorological patterns. During the warmer months (June-August), prevailing westerly winds typically provide good ventilation, dispersing any locally generated pollutants. However, periods of calm weather can lead to localized stagnation, particularly in the town centre, potentially increasing concentrations of volatile organic compounds (VOCs) from vegetation and traffic. Autumn (September-November) often brings increased humidity and occasional fog, which can trap pollutants near the ground, especially during periods of light winds. Agricultural activities, such as harvesting and field preparation, contribute to particulate matter during this time. Winter (December-February) presents the greatest air quality challenges. Temperature inversions, where a layer of warm air sits above cooler air near the ground, are common, preventing vertical mixing and trapping pollutants. This is exacerbated by reduced sunlight hours and colder temperatures, which slow down chemical reactions that would otherwise break down pollutants. Spring (March-May) sees a gradual improvement as temperatures rise, and wind patterns become more frequent, flushing out accumulated pollutants. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should be particularly cautious during winter months and periods of fog, limiting prolonged outdoor exposure and avoiding areas with heavy traffic. During the warmer months, while generally good, brief periods of elevated VOCs warrant awareness, especially for those with sensitivities to fragrances or solvents.