Pollutant | NAAQS limit | 2005 | 2006 | 2007 | 2008 | 2009 |
PM2.5 | 20 μg/m3 | – | – | – | – | – |
PM10 | 40 μg/m3 | 38 | 35 | 39 | 37 | – |
SO2 | 19 ppb | 9 | 8 | 6 | – | 8 |
NO2 | 21 ppb | 7 | – | 11 | 11 | 8 |
Pollutant | NAAQS limit | 2010 | 2011 | 2012 | 2013 | 2014 |
PM2.5 | 20 μg/m3 | – | – | 13 | 13 | 15 |
PM10 | 40 μg/m3 | 30 | 28 | 30 | 33 | 45 |
SO2 | 19 ppb | 7 | 7 | 8 | 7 | 9 |
NO2 | 21 ppb | 10 | 10 | 9 | 11 | 14 |
Pollutant | NAAQS limit | 2015 | 2016 | 2017 | 2018 | 2019 |
PM2.5 | 20 μg/m3 | – | 16 | – | – | – |
PM10 | 40 μg/m3 | – | 38 | – | – | – |
SO2 | 19 ppb | 7 | 8 | – | – | – |
NO2 | 21 ppb | 11 | 9 | – | – | – |