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).
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)。
However, the United States embassy, which conducts its own measurements based on the concentration of PM2.5 in the air, rated Monday's air in Beijing as "hazardous".
然而，美国大使馆根据其基于空气中直径小于2.5微米的颗粒物浓度而测量出的结果，则将北京星期一的空气质量等级评为“有害的”。
China has vowed to launch its strictest environmental protection system and reduce the concentration of PM2.5 particulate pollution in cities with poor air quality by 18 percent by 2020.
中国已承诺施行最严格的环境保护条例，并预计在2020年之前将严重污染城市的PM 2.5颗粒污染浓度降低十八个百分点。
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