What is a smog warning?
The Info-Smog program provides a daily regional air quality forecast based on the three same categories as the Air Quality Index (AQI): good, acceptable, and poor. When the forecast calls for poor air quality, a smog warning is issued for the regions concerned. Smog especially affects people with respiratory ailments or heart disease. It is therefore recommended that these individuals avoid intense physical activity outdoors until the smog warning is lifted.