翻译求助~急!谢谢? 26th highest maximum daily 8-hour mean ozone concentration observed at (sub)urban background stations, compliance with the target is assured when this value is below 120 ug/m3, 2001-2011 (EU-27) Only urban and sub-urban background monitoring stations have been included in the calculations.查看更多6个回答 . 4人已关注