The data describes nitrogen oxide (NOx) emissions from the United States transportation sector from 1990 to 2017. In 2017, NOx emissions from the United States transportation sector amounted to some 6.4 million tons.
1990 | 13373 |
1993 | 13143 |
1996 | 12912 |
1999 | 12456 |
2002 | 15201 |
2005 | 12612 |
2008 | 10426 |
2011 | 8952 |
2014 | 7559 |
2017 | 6355 |