北京市政府日前承诺，到2020年，该市细颗粒物(PM2.5)的年均浓度将比2015年下降30%。

　　According to the city's environmental protection plan for the 2016-2020 period, which was approved last Tuesday, the annual average concentration of PM2.5 will be around 56 micrograms per cubic meter in 2020.

　　依据上周二通过的北京市"十三五"时期环境保护规划，2020年，北京市PM2.5年均浓度将降至每立方米56微克左右。

　　The number of days with good air quality will be above 56% in 2020.

　　2020年，全市空气质量优良天数比例将会超过56%。

　　北京十三五生态环保目标 PM2.5年均浓度五年降三成

　　The city will further shift from burning coal to using gas, electricity and solar power. By 2020, the city will have removed all coal burning boilers and the proportion of clean and high-quality energy will be above 90%.

　　北京市将进一步推行煤改气、煤改电及煤改太阳能。到2020年，北京市将取消所有燃煤锅炉，清洁优质能源比重将达到90%以上。

　　In addition, more cars with high emissions will be banned from the roads.

　　此外，更多高排放机动车将不得上路。

　　At the same time, the city will continue to address water and soil pollution. In 2020, the city's total water use will be within 4.3 billion cubic meters.

　　与此同时，北京市将继续治理水土污染问题。2020年，全市用水总量将控制在43亿立方米以内。