What is a smog alert?
A Smog Alert is issued when air quality is expected to be poor over a period of time. The Ministry of the Environment may issue two types of Smog Alerts: • A Smog Watch is issued when there is a 50% probability that elevated smog levels will occur within the next three days. • A Smog Advisory is issued when there is a strong likelihood of elevated smog levels occurring within the next 24 hours or if smog conditions happened without warning. A Smog Advisory Termination Notice is issued by the Ministry of the Environment after the weather changes, the air clears and a Smog Advisory is no longer required. More information about smog alerts or to subscribe to the Smog Alert Network, visit the Ministry of the Environments website. Components of smog The components that form smog include ground-level ozone, fine particulate matter, nitrogen oxides, volatile organic compounds, sulphur dioxide, and carbon monoxide. The two components of smog that have the most impact on our health and the envi
