Measuring ambient concentrations of airborne pollutants as defined by the Canadian Ambient Air Quality Standards (CAAQS).
| Red |
National standards exceeded, advanced action is required by regulations |
| Orange |
Action needed to prevent exceeding national standards |
| Yellow |
Action needed to prevent air quality deterioration |
| Green |
Air quality is good and is maintained through proactive actions |
| *2024 Results - Partly Achieving |
| |
Baseline (2009) |
2024 Result |
Target (2035): not to exceed |
| Fine Particulate Matter (PM2.5) |
Yellow |
Yellow |
Yellow |
| Ozone (O3) |
Yellow |
Yellow |
Yellow |
| Sulphur dioxide (SO2) |
Green |
Green |
Yellow |
| Nitrogen dioxide (NO2) |
Orange |
Orange |
Yellow |
| Historical results |
| |
PM2.5 |
O3 |
SO2 |
NO2 |
| 2024 |
Yellow |
Yellow |
Green |
Orange |
| 2023 |
Yellow |
Yellow |
Green |
Orange |
| 2022 |
Yellow |
Yellow |
Green |
Orange |
| 2021 |
Orange |
Yellow |
Green |
Orange |
| 2020 |
Orange |
Yellow |
Green |
Orange |
| 2019 |
Orange |
Yellow |
Green** |
Orange** |
| 2018 |
Orange |
Yellow |
Green** |
Orange** |
| 2017 |
Orange |
Yellow |
Green** |
Orange** |
| 2016 |
Yellow |
Yellow |
Green** |
Orange** |
| 2015 |
Orange |
Yellow |
Green** |
Orange** |
| 2014 |
Orange |
Yellow |
Green** |
Orange** |
| 2013 |
Red |
Yellow |
Green** |
Orange** |
| 2012 |
Red |
Yellow |
Green** |
Red** |
| 2011 |
Red |
Yellow |
Green** |
Orange** |
| 2010 |
Orange |
Yellow |
Green** |
Orange** |
| 2009 |
Yellow |
Yellow |
Green** |
Orange** |
* 2025 air quality results are still being determined. The results table will be updated when data is available.
** Prior to 2020, SO2 and NO2 were calculated differently and were not assigned colours. These are unofficial estimates as to what the status would have been.