Air quality advisory issued for Fraser Valley, eastern Metro Vancouver

Metro Vancouver has issued an air quality advisory for eastern parts of Metro Vancouver and the Fraser Valley due to high concentrations of ground-level ozone.
Residents are advised to avoid strenuous outdoor activities during mid-afternoon, when ozone levels are highest. Exposure is particularly a concern for infants, the elderly and those who have underlying respiratory conditions.  
Ground-level ozone is formed when nitrogen oxides and volatile organic compounds react in the air in