FLCN21 CWTO 272045 AIR QUALITY HEALTH INDEX FORECAST FOR ONTARIO ISSUED JOINTLY BY ENVIRONMENT CANADA AND THE PROVINCE OF ONTARIO AT 5:00 P.M. EDT MONDAY 27 APRIL 2026 FOR TONIGHT TUESDAY AND WEDNESDAY. THE NEXT SCHEDULED FORECAST WILL BE ISSUED AT 6:00 A.M. EDT TUESDAY. TORONTO. TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. TORONTO DOWNTOWN. TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 4 OR MODERATE RISK. TUESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. TORONTO EAST. TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. TORONTO NORTH. TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. TORONTO WEST. TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. WINDSOR. TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. TUESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. WINDSOR DOWNTOWN. TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. TUESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. WINDSOR WEST. TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. TUESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. CHATHAM. TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. TUESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. SARNIA. TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. TUESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. PORT STANLEY. TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. LONDON. TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. TUESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. GRAND BEND. TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. TUESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. TIVERTON. TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. TUESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. BRANTFORD. TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. KITCHENER. TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. TUESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. GUELPH. TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. ST. CATHARINES. TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. HAMILTON. TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. TUESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. HAMILTON DOWNTOWN. TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. TUESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. HAMILTON MOUNTAIN. TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. TUESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. HAMILTON WEST. TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. TUESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. BURLINGTON. TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. OAKVILLE. TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. MILTON. TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. TUESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. MISSISSAUGA. TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. BRAMPTON. TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. OSHAWA. TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. TUESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. TUESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. NEWMARKET. TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. BARRIE. TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. TUESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. TUESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. PETERBOROUGH. TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. TUESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. TUESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. DORSET. TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. TUESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. TUESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. PARRY SOUND. TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. TUESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. BELLEVILLE. TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. TUESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. TUESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. KINGSTON. TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. TUESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. TUESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. CORNWALL. TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. OTTAWA. TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. TUESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. GATINEAU. TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. TUESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. NORTH BAY. TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. TUESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. TUESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. SUDBURY. TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. TUESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. TUESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. SAULT STE. MARIE. TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK. TUESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. TUESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. THUNDER BAY. TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. TUESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. TUESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK. AIR QUALITY HEALTH INDEX SCALE: 1-3 LOW HEALTH RISK 4-6 MODERATE HEALTH RISK 7-10 HIGH HEALTH RISK ABOVE 10 VERY HIGH HEALTH RISK FOR MORE INFORMATION, CONSULT WWW.AIRHEALTH.CA END