我一開始跟帖說的就是pm2.5
而且每個國家指數的算法,區分,標準都不同,地區橫向比較,客觀是具體數值。
本帖於 2016-01-03 06:03:24 時間, 由普通用戶 zacao 編輯
我一開始跟帖說的就是pm2.5
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