Air Pollutant Concentrations Trend - Yuen Long
| YEAR | NO2 | PM10 | PM2.5 |
|---|---|---|---|
| 2023 | 37 | 26 | 16 |
| 2022 | 37 | 25 | 16 |
| 2021 | 40 | 30 | 17 |
| 2020 | 32 | 30 | 16 |
| 2019 | 44 | 37 | 20 |
| 2018 | 43 | 37 | 20 |
| 2017 | 41 | 40 | 22 |
| 2016 | 46 | 37 | 23 |
| 2015 | 45 | 44 | 30 |
| 2014 | 52 | 50 | 35 |
| 2013 | 54 | 56 | 37 |
| 2012 | 49 | 44 | 29 |
| 2011 | 54 | 54 | 36 |
| 2010 | 54 | 49 | 32 |
| 2009 | 52 | 51 | 33 |
| 2008 | 56 | 60 | 41 |
| 2007 | 55 | 64 | 43 |
| 2006 | 58 | 62 | 43 |
| 2005 | 58 | 62 | 42 |
| 2004 | 67 | 71 | NA |
| 2003 | 60 | 61 | NA |
| 2002 | 56 | 53 | NA |
| 2001 | 61 | 57 | NA |
| 2000 | 57 | 56 | NA |
| 1999 | 60 | 62 | NA |
AAQI Long Term Trend - Yuen Long
| YEAR | NO2 | PM10 | PM2.5 |
|---|---|---|---|
| 2023 | 0.9 | 1.3 | 1.6 |
| 2022 | 0.9 | 1.3 | 1.6 |
| 2021 | 1.0 | 1.5 | 1.7 |
| 2020 | 0.8 | 1.5 | 1.6 |
| 2019 | 1.1 | 1.9 | 2.0 |
| 2018 | 1.1 | 1.9 | 2.0 |
| 2017 | 1.0 | 2.0 | 2.2 |
| 2016 | 1.2 | 1.9 | 2.3 |
| 2015 | 1.1 | 2.2 | 3.0 |
| 2014 | 1.3 | 2.5 | 3.5 |
| 2013 | 1.4 | 2.8 | 3.7 |
| 2012 | 1.2 | 2.2 | 2.9 |
| 2011 | 1.4 | 2.7 | 3.6 |
| 2010 | 1.4 | 2.5 | 3.2 |
| 2009 | 1.3 | 2.6 | 3.3 |
| 2008 | 1.4 | 3.0 | 4.1 |
| 2007 | 1.4 | 3.2 | 4.3 |
| 2006 | 1.5 | 3.1 | 4.3 |
| 2005 | 1.5 | 3.1 | 4.2 |
| 2004 | 1.7 | 3.6 | NA |
| 2003 | 1.5 | 3.1 | NA |
| 2002 | 1.4 | 2.7 | NA |
| 2001 | 1.5 | 2.9 | NA |
| 2000 | 1.4 | 2.8 | NA |
| 1999 | 1.5 | 3.1 | NA |