在那些污染严重的城市，如德里，微粒含量平均值超过了300微克，其中大多数可能都是PM 2.5。
In heavily polluted cities such as Delhi, particle levels average over 300 micrograms and most of this is probably PM2.5s.
在那些污染严重的城市，如德里，微粒含量平均值超过了300微克，其中大多数可能都是PM 2.5。
In heavily polluted cities such as Delhi, particle levels average over 300 micrograms and most of this is probably PM2.5s.
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