| NOx, tonnes |
Public electricity and heat prod. | Petroleum refining | Other energy industries | Industry | Commercial / Institutional | Residential | Agriculture / Forestry / Fisheries | Total |
| 1990 | 90 483 | 1 616 | 2 295 | 13 277 | 1 188 | 4 939 | 1 144 | 114 941 |
| 1991 | 131 604 | 1 799 | 2 361 | 15 465 | 1 099 | 5 335 | 1 272 | 158 935 |
| 1992 | 90 389 | 2 094 | 2 762 | 16 032 | 1 020 | 4 914 | 1 171 | 118 382 |
| 1993 | 93 005 | 2 174 | 2 809 | 16 018 | 1 056 | 5 495 | 1 109 | 121 666 |
| 1994 | 98 222 | 1 892 | 3 066 | 14 945 | 1 373 | 5 236 | 1 213 | 125 947 |
| 1995 | 83 237 | 1 949 | 3 226 | 14 678 | 1 514 | 5 213 | 1 383 | 111 201 |
| 1996 | 120 206 | 2 417 | 3 774 | 15 630 | 1 567 | 5 509 | 1 610 | 150 714 |
| 1997 | 78 581 | 1 958 | 4 940 | 15 737 | 1 615 | 5 117 | 1 579 | 109 527 |
| 1998 | 64 004 | 1 677 | 5 461 | 16 052 | 1 512 | 4 874 | 1 634 | 95 214 |
| 1999 | 51 504 | 1 524 | 5 935 | 15 033 | 1 554 | 4 762 | 1 564 | 81 878 |
| 2000 | 42 715 | 1 393 | 6 285 | 14 922 | 1 304 | 4 723 | 1 399 | 72 741 |
| 2001 | 42 594 | 1 704 | 6 140 | 14 763 | 1 176 | 5 159 | 1 369 | 72 905 |
| 2002 | 44 215 | 1 566 | 6 583 | 13 597 | 1 144 | 5 056 | 1 292 | 73 453 |
| 2003 | 54 793 | 1 543 | 6 595 | 12 746 | 1 313 | 5 336 | 1 268 | 83 593 |
| 2004 | 43 284 | 1 486 | 6 806 | 12 743 | 1 063 | 5 406 | 1 243 | 72 033 |
| 2005 | 37 604 | 1 284 | 6 982 | 12 324 | 1 104 | 5 815 | 1 141 | 66 255 |
| 2006 | 41 853 | 1 519 | 7 128 | 12 068 | 998 | 6 031 | 975 | 70 573 |
| 2007 | 33 157 | 1 467 | 7 067 | 10 549 | 892 | 6 451 | 816 | 60 399 |
| 2008 | 24 266 | 1 423 | 7 033 | 9 228 | 831 | 6 226 | 751 | 49 758 |
| 2009 | 19 796 | 1 610 | 6 686 | 6 764 | 812 | 6 192 | 702 | 42 563 |