Annual average of NO2 concentrations from respective air monitoring station (ug/m3)
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Annual emissions of NO2
| Category | Żejtun | Msida | Għarb | Attard | St Paul Bay |
|---|---|---|---|---|---|
| 2006 | 16.2 | 62.2 | 0 | 0 | 0 |
| 2007 | 12.4 | 51 | 4.3 | 0 | 0 |
| 2008 | 19.2 | 60.9 | 5 | 0 | 0 |
| 2009 | 0 | 35.9 | 3.4 | 0 | 0 |
| 2010 | 0 | 34.9 | 3 | 0 | 0 |
| 2011 | 16.4 | 38 | 3 | 0 | 0 |
| 2012 | 22.8 | 37.3 | 2.7 | 0 | 0 |
| 2013 | 13.8 | 35.4 | 2.9 | 0 | 0 |
| 2014 | 14.4 | 30.8 | 2.9 | 10.1 | 0 |
| 2015 | 13.6 | 35.8 | 3 | 11.6 | 0 |
| 2016 | 14.5 | 36.4 | 2.8 | 12 | 0 |
| 2017 | 14.5 | 37.5 | 3 | 11.9 | 0 |
| 2018 | 13.7 | 34.6 | 3.3 | 11 | 0 |
| 2019 | 14.8 | 30.3 | 3.1 | 11.6 | 0 |
| 2020 | 12.8 | 24.3 | 2.6 | 9.5 | 0 |
| 2021 | 12.9 | 27.1 | 2.7 | 10.9 | 0 |
| 2022 | 13.8 | 30.2 | 2.5 | 10.6 | 21.9 |
| 2023 | 14.4 | — | 2.5 | 11.5 | 20.3 |
| 2024 | 14.1 | 23.3 | 2.4 | 11.8 | 19.5 |
Nitrogen oxides are emitted during fuel combustion from industrial facilities and the road transport sector. NOX is a group of gases comprising nitrogen monoxide (NO) and nitrogen dioxide (NO2). NO makes up the majority of NOX emissions. NOX contributes to the formation of ozone and particulate matter.
Particulate matter (PM) is a mixture of aerosol particles (solid and liquid) covering a wide range of sizes and chemical compositions. PM is either directly emitted as primary particles or it forms in the atmosphere from emissions of certain precursor pollutants such as SO2, NOX, NH3 and NMVOCs. PM is emitted from many anthropogenic sources, including both combustion and non-combustion sources. Natural emissions of PM also occur, including from sea salt and windblown Saharan dust.
Source: Environment and Resources Authority (ERA)
Last Updated: February 6, 2026