According to the annual mean values, there is a clear trend, while in 2012, the mean PM 10 concentration was 19.54 μg/m 3 ; in 2017, it was only 14.93 μg/m 3 which is almost a 24% decrease.
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Major air pollutants seasonal variation analysis and long-range transport of PM<sub>10</sub> in an urban environment with specific climate condition in Transylvania (Romania).
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