Yellow air quality warning ended for Toronto, parts of the GTA
Posted March 4, 2026 7:43 pm.
Last Updated March 5, 2026 9:12 am.
A yellow air quality warning has ended for Toronto and parts of the GTA as stagnant winter weather conditions were creating elevated pollution levels.
Environment Canada ended the warning on Thursday around 3:46 a.m. after issuing the warning Wednesday evening as light winds and the current weather conditions will expected to cause “increasing levels of fine particles and nitrogen dioxide.”
The Air Quality Health Index for Toronto was classified as high risk.
What to do during air quality warnings
The weather agency says when pollution levels are high, everyone should limit being outside. Some people may experience eye, nose and throat irritation, headaches or mild coughs.
Those who are 65 years of age or older, pregnant people, infants and young children, people with existing illness and people who work outdoors are more likely to be impacted by the air quality.
Showers are expected on Thursday with the potential for freezing drizzle and a high of 3 C.
