100
PM2.5
1990
100
PM2.5
1991
100
PM2.5
1992
100
PM2.5
1993
100
PM2.5
1994
100
PM2.5
1995
100
PM2.5
1996
112.5
PM2.5
1997
112.5
PM2.5
1998
112.5
PM2.5
1999
112.5
PM2.5
2000
100
PM2.5
2001
100
PM2.5
2002
100
PM2.5
2003
100
PM2.5
2004
100
PM2.5
2005
100
PM2.5
2006
100
PM2.5
2007
100
PM2.5
2008
100
PM2.5
2009
87.5
PM2.5
2010
87.5
PM2.5
2011
87.5
PM2.5
2012
75
PM2.5
2013
75
PM2.5
2014
62.5
PM2.5
2015