Actually, the W.H.O. has said that PM 2.5 should not exceed 25 micrograms per cubic meter over a 24-hour period. By that standard, Beijing still might not have healthy air by 2030. The limit of 35 micrograms per cubic meter, mistakenly cited by China Daily as the W.H.O. standard, is actually just an interim target set by the W.H.O. for heavily polluted countries. For all nations, the W.H.O. recommends achieving the standard of 25 micrograms per cubic meter.
实 际上,WHO说的是PM2.5平均浓度要在24小时内不超过25微克/立方米。按照这个标准,北京的空气质量可能在2030年前无法达标。《中国日报》错 误地引用了WHO设定的35微克/立方米的标准,实际上那是WHO为污染严重的国家设定的过渡目标。WHO建议所有国家达到25微克/立方米的标准。
China Daily cited Mr. Pan as saying an average PM 2.5 concentration of 35 micrograms per cubic meter could be reached by 2030.
《中国日报》援引潘涛的话称,北京的PM2.5年均浓度有望在2030年达标。
The Beijing Environmental Protection Bureau has said the average PM 2.5 concentration last year was 89.5 micrograms per cubic meter, which is more than 3.5 times the W.H.O. recommended exposure limit. On a particularly grim day in January 2013 that is now commonly called the “airpocalypse” by English speakers, parts of Beijing had PM 2.5 concentrations that were 40 times the W.H.O. recommended limit.
【北京还要再吸雾霾多少年 数据告诉你】相关文章:
★ 睡眠不足怎么办?
★ 又到一年飞絮季 北京绘“杨柳地图” 力争到2020年改善
最新
2020-09-15
2020-09-15
2020-09-15
2020-09-15
2020-09-15
2020-09-15