FLCN21 CWTO 212045
AIR QUALITY HEALTH INDEX FORECAST FOR ONTARIO ISSUED JOINTLY BY
ENVIRONMENT CANADA AND THE PROVINCE OF ONTARIO AT 5:00 P.M. EDT
TUESDAY 21 APRIL 2026 FOR TONIGHT WEDNESDAY AND THURSDAY.
THE NEXT SCHEDULED FORECAST WILL BE ISSUED AT 6:00 A.M. EDT
WEDNESDAY.

TORONTO
TORONTO DOWNTOWN
TORONTO EAST
TORONTO NORTH
TORONTO WEST
HAMILTON
HAMILTON DOWNTOWN
HAMILTON MOUNTAIN
HAMILTON WEST
BURLINGTON.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 4 OR MODERATE RISK.
WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 4 OR MODERATE RISK.
WEDNESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 4 OR MODERATE RISK.
THURSDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.

WINDSOR
WINDSOR DOWNTOWN
WINDSOR WEST
CHATHAM
SARNIA.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 4 OR MODERATE RISK.
WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
WEDNESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
THURSDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.

PORT STANLEY
LONDON
GRAND BEND
BRANTFORD
KITCHENER
GUELPH
ST. CATHARINES
OAKVILLE
MILTON
MISSISSAUGA
BRAMPTON
OSHAWA
NEWMARKET.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
WEDNESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
THURSDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.

TIVERTON
BARRIE
PETERBOROUGH
DORSET
PARRY SOUND
BELLEVILLE
KINGSTON
CORNWALL
OTTAWA
GATINEAU
NORTH BAY
SUDBURY.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
WEDNESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
THURSDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.

SAULT STE. MARIE.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 4 OR MODERATE RISK.
WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
WEDNESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.
THURSDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.

THUNDER BAY.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.
WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.
WEDNESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.
THURSDAY..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

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