随着排放强度和气象条件的改变，痕量金属的月平均质量浓度也发生相应变化。
It is found that the mean mass concentrations varied from month to month due to changes in emission intensity and meteorological conditions.
空气质量用年平均细颗粒物的浓度表示(PM 10至PM 2.5，即粒径小于等于10或2.5微米的细颗粒)。
Air quality is represented by annual mean concentration of fine particulate matter (PM10 and PM2.5, i.e. particles smaller than 10 or 2.5 microns).
除此之外，2006年改变空气质量监测网的做法也会误导污染物年平均浓度出现改善的结论。
Beyond 'blue sky' reporting, the 2006 change in the air quality monitoring network also has resulted in misleading improvements in reported annual pollutant concentrations.
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