National Trends in Nitrogen_Dioxide Concentrations in 2000 - 2016
| Year |
Mean |
Number of Trend Sites |
10th Percentile |
90th Percentile |
| 2000 |
56.2190184049079 |
163 |
35 |
79 |
| 2001 |
55.3644171779141 |
163 |
34 |
76 |
| 2002 |
53.0132924335378 |
163 |
32 |
79 |
| 2003 |
52.3877300613497 |
163 |
32 |
75 |
| 2004 |
49.6398773006135 |
163 |
29 |
70 |
| 2005 |
49.1629856850715 |
163 |
29 |
69 |
| 2006 |
48.2656441717791 |
163 |
28 |
67 |
| 2007 |
46.7865030674846 |
163 |
27 |
65 |
| 2008 |
45.9687116564417 |
163 |
28 |
66 |
| 2009 |
42.5820040899795 |
163 |
24 |
60 |
| 2010 |
43.2810838445807 |
163 |
25 |
59 |
| 2011 |
42.4839468302658 |
163 |
23.2 |
60 |
| 2012 |
40.490081799591 |
163 |
23 |
58.9 |
| 2013 |
40.2081799591002 |
163 |
21 |
57.6 |
| 2014 |
40.1423312883435 |
163 |
20.8 |
57 |
| 2015 |
38.6557259713701 |
163 |
19 |
55 |
| 2016 |
37.4294478527607 |
163 |
19 |
55 |