?? ?????:??????PM2.5??????????
![](https://image.chezhanri.com/2019/0320/20190320152558433.jpg)
????:1????????:?????????????
2???????
3??????????????
4??????????????
5??????????
???9???????????????????5???????,???????????????????«????»?????????,?????????????????????????????
???????????????????????????,???????450??????????,??????????????????????,????,??????????
??,?PM2.5(???????)???????????????????????,?????????????PM2.5???????????,????????????????,??????????????PM2.5????,??????????????,????,????????????????PM2.5?????????????
???,???????,??????????????,??????????,??????????,??15%????????????????????,????????????,????,???????????????????????????????????????????(???? ? ????) ??????????:?????