82 ppb over one hour. Levels above this value pose an increasingly greater risk of respiratory effects. Readings are updated hourly, from 7 a.m. to 7 p.m., seven days a week. Canadian data is submitted by participating provinces to Environment Canada's Meteorological Service of Canada. There it is collated and transferred to the EPA in South Carolina, where a supercomputer creates the merged maps.
Organizers hope to add information on ozone levels in other provinces.
If you are interested in obtaining information about air quality programs in your region, visit the air quality services program .