| Forecast Region | Sub-region | Warning Type |
|---|---|---|
| Sarnia - Lambton | Sarnia - Petrolia - Western Lambton County | |
| Sarnia - Lambton | Watford - Pinery Park - Eastern Lambton County | |
| Huron - Perth | Goderich - Bluewater - Southern Huron County |
Note:
Yellow Warning - Air Quality: A yellow warning for air quality is issued when the AQHI is forecast to reach the high-risk category (AQHI of 7 or greater).
Orange Warning - Air Quality: An orange warning for air quality is issued when the AQHI is forecast to reach, or has reached, the very-high risk category (AQHI of 10+).
