year
|
CO
|
NOx
|
NMVOC
|
SOx
|
SOx2
|
SOx ecl.
|
SOx excl. international shipping
|
PM2.5
|
1990
|
100
|
100
|
100
|
100
|
|
|
100
|
100
|
1991
|
99
|
99
|
96
|
96
|
|
|
96
|
100
|
1992
|
95
|
100
|
94
|
96
|
|
|
98
|
101
|
1993
|
90
|
99
|
89
|
100
|
|
|
99
|
101
|
1994
|
84
|
96
|
83
|
95
|
|
|
95
|
99
|
1995
|
79
|
95
|
79
|
91
|
|
|
83
|
100
|
1996
|
76
|
95
|
77
|
91
|
|
|
77
|
99
|
1997
|
71
|
94
|
72
|
90
|
|
|
62
|
99
|
1998
|
67
|
94
|
68
|
94
|
|
|
61
|
99
|
1999
|
61
|
92
|
63
|
91
|
|
|
59
|
97
|
2000
|
56
|
93
|
58
|
89
|
|
|
49
|
94
|
2001
|
52
|
90
|
54
|
92
|
|
|
49
|
94
|
2002
|
48
|
87
|
49
|
89
|
|
|
43
|
90
|
2003
|
44
|
87
|
45
|
95
|
|
|
44
|
90
|
2004
|
41
|
88
|
41
|
98
|
|
|
45
|
91
|
2005
|
35
|
86
|
36
|
97
|
|
|
39
|
90
|
2006
|
32
|
86
|
33
|
101
|
|
|
39
|
92
|
2007
|
29
|
86
|
31
|
103
|
|
|
41
|
92
|
2008
|
26
|
82
|
28
|
92
|
|
|
25
|
88
|
2009
|
24
|
76
|
25
|
87
|
|
|
26
|
84
|
2010
|
21.5
|
73.7
|
23
|
81.7
|
|
|
23.8
|
79.7
|
2011
|
21.6
|
74.4
|
22
|
83.5
|
|
|
24.2
|
79.9
|