National Trends in Nitrogen_Dioxide Concentrations in 1980 - 2008
| Year |
Mean |
Number of Trend Sites |
10th Percentile |
90th Percentile |
| 1980 |
0.02818133333333 |
75 |
0.0145 |
0.0498 |
| 1981 |
0.02773644444444 |
75 |
0.0136 |
0.0498 |
| 1982 |
0.02670288888888 |
75 |
0.0136 |
0.0476 |
| 1983 |
0.025912 |
75 |
0.0126 |
0.0456 |
| 1984 |
0.02653244444444 |
75 |
0.014 |
0.0463 |
| 1985 |
0.026328 |
75 |
0.0139 |
0.0475 |
| 1986 |
0.026398 |
75 |
0.0145 |
0.0468 |
| 1987 |
0.02595555555555 |
75 |
0.0149 |
0.0426 |
| 1988 |
0.026526 |
75 |
0.0154 |
0.0472 |
| 1989 |
0.02574266666666 |
75 |
0.0136 |
0.0428 |
| 1990 |
0.02446577777777 |
75 |
0.0129 |
0.0408 |
| 1991 |
0.02433088888888 |
75 |
0.0113 |
0.0426 |
| 1992 |
0.02336666666666 |
75 |
0.0128 |
0.0396 |
| 1993 |
0.022788 |
75 |
0.0126 |
0.0372 |
| 1994 |
0.024036 |
75 |
0.0127 |
0.0415 |
| 1995 |
0.02298986666666 |
75 |
0.01265 |
0.0393 |
| 1996 |
0.022454 |
75 |
0.0122 |
0.0376 |
| 1997 |
0.021516 |
75 |
0.0119 |
0.0338 |
| 1998 |
0.02143266666666 |
75 |
0.0115 |
0.0355 |
| 1999 |
0.02209933333333 |
75 |
0.0124 |
0.0376 |
| 2000 |
0.020594 |
75 |
0.0114 |
0.0361 |
| 2001 |
0.02051733333333 |
75 |
0.0116 |
0.0356 |
| 2002 |
0.01962666666666 |
75 |
0.0116 |
0.0329 |
| 2003 |
0.01898933333333 |
75 |
0.0107 |
0.0312 |
| 2004 |
0.01751533333333 |
75 |
0.0105 |
0.0272 |
| 2005 |
0.01737466666666 |
75 |
0.0092 |
0.0274 |
| 2006 |
0.01632 |
75 |
0.0097 |
0.027 |
| 2007 |
0.01575466666666 |
75 |
0.0095 |
0.0255 |
| 2008 |
0.01484266666666 |
75 |
0.0082 |
0.0234 |