West Trends in PM25 Concentrations in 2000 - 2020
| Year |
Mean |
Number of Trend Sites |
10th Percentile |
90th Percentile |
| 2000 |
14.1587354137158 |
48 |
7.85804675499232 |
22.5069282343334 |
| 2001 |
14.5132989547773 |
48 |
8.05322128851541 |
22.4918091168091 |
| 2002 |
15.0458445011636 |
48 |
9.07257518796992 |
23.2223025583982 |
| 2003 |
12.7124733460298 |
48 |
7.33706989247312 |
19.3102826865142 |
| 2004 |
12.3219231642719 |
48 |
6.98880952380952 |
18.8581625004939 |
| 2005 |
11.6949018411798 |
48 |
6.75833333333333 |
17.9631981723383 |
| 2006 |
11.6176236735059 |
48 |
6.84721726190476 |
17.6173252688172 |
| 2007 |
11.6904510202688 |
48 |
6.1870467032967 |
18.8772903726708 |
| 2008 |
11.7631189800684 |
48 |
7.13627529553196 |
16.3910237778609 |
| 2009 |
10.6763739655508 |
48 |
5.81666666666666 |
16.0410187245086 |
| 2010 |
9.21001894384492 |
48 |
5.94031683523212 |
13.5757675194661 |
| 2011 |
9.96670088745635 |
48 |
6.30347813779288 |
15.4045512820513 |
| 2012 |
9.38315691186565 |
48 |
5.90372023809524 |
14.5028859103859 |
| 2013 |
10.4693789070699 |
48 |
6.64670355691912 |
15.9259523809524 |
| 2014 |
9.63772901037692 |
48 |
5.47295933535064 |
14.7598698449591 |
| 2015 |
9.48615437824805 |
48 |
5.70959094399687 |
14.963867604316 |
| 2016 |
9.12403072750369 |
48 |
5.91969209795899 |
12.9816666666667 |
| 2017 |
10.1448001716992 |
48 |
7.09358211233211 |
15.0319362048366 |
| 2018 |
11.4864898487688 |
48 |
6.99425597264783 |
17.135119047619 |
| 2019 |
8.11774408039844 |
48 |
5.19202998088868 |
11.3902202447164 |
| 2020 |
11.6503093842239 |
48 |
6.84811587868653 |
19.1115394063804 |