2021年，地级及以上城市空气质量优良天数比率为87.5%

China's environment further improved last year according to an official report on environmental conditions in 2021.

国务院关于2021年度环境状况和环境保护目标完成情况的报告显示，2021年，全国生态环境质量明显改善。

Last year, the percentage of days with good air quality was 87.5 percent in cities at and above the prefectural-level, up 0.5 percentage points year-on-year according to the report, which was submitted on Monday to the National People's Congress Standing Committee for review.
4月18日，十三届全国人大常委会第三十四次会议听取国务院关于2021年度环境状况和环境保护目标完成情况的报告。报告指出，2021年，全国空气质量持续向好。地级及以上城市空气质量优良天数比率为87.5%，同比上升0.5个百分点。

The average concentration of PM2.5 hazardous particles was 30 micrograms per cubic meter, down 9.1 percent year-on-year.
细颗粒物(PM2.5)平均浓度为30微克/立方米，同比下降9.1%。

The proportion of surface water at or above Grade III in the country's five-tier water quality system increased 1.5 percentage points year-on-year to 84.9 percent in 2021, and the proportion of surface water below Grade V, the lowest level, stood at 1.2 percent.
2021年，我国地表水Ⅰ—Ⅲ类水质断面比例为84.9%，与2020年相比上升1.5个百分点；劣Ⅴ类水质断面比例为1.2%。