Table 1.
PM2.5 annual concentrations in μg/m3 for the North vs. the South selected monitoring stations. The differences are significant with a p < 0.0001.
| Year | Pedregal | Xalostoc | ||
|---|---|---|---|---|
|
|
|
|||
| Mean | SD | Mean | SD | |
| 1997 | 21.6 | 16.6 | 71.3 | 34.1 |
| 1998 | 29.3 | 16.8 | 64.9 | 25.4 |
| 1999 | 24.4 | 9.2 | 71.0 | 26.6 |
| 2000 | 24.7 | 11.3 | 54.8 | 25.3 |
| 2001 | 23.6 | 10.1 | 41.1 | 17.2 |
| 2002 | 23.1 | 9.7 | 38.0 | 13.7 |
| 2003 | 23.4 | 11.3 | 41.8 | 14.4 |
| 2004 | 18.4 | 9.4 | 35.5 | 14.7 |
| 2005 | 20.9 | 11.5 | 30.4 | 17.1 |
| 2006 | 17.8 | 8.4 | 29.8 | 15.6 |
| 2007 | 16.2 | 8.5 | 25.3 | 11.3 |
| 2008 | 18.0 | 8.3 | 26.3 | 10.0 |
| 2009 | 18.4 | 8.7 | 26.4 | 10.7 |
| 2010 | 14.4 | 7.4 | 24.9 | 13.2 |
| 2011 | 16.7 | 8.3 | 24.7 | 11.5 |
| 2012 | 17.0 | 7.5 | 25.9 | 11.7 |