FLCN21 CWTO 052145
AIR QUALITY HEALTH INDEX FORECAST FOR ONTARIO ISSUED JOINTLY BY
ENVIRONMENT CANADA AND THE PROVINCE OF ONTARIO AT 5:00 P.M. EST
THURSDAY 5 MARCH 2026 FOR TONIGHT FRIDAY AND SATURDAY.
THE NEXT SCHEDULED FORECAST WILL BE ISSUED AT 6:00 A.M. EST FRIDAY.

TORONTO
TORONTO EAST
TORONTO WEST
GUELPH
MILTON
MISSISSAUGA
BRAMPTON.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
FRIDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
FRIDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
SATURDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.

TORONTO DOWNTOWN.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
FRIDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
FRIDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
SATURDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.

TORONTO NORTH.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
FRIDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
FRIDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
SATURDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.

WINDSOR.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.
FRIDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.
FRIDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
SATURDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.

WINDSOR DOWNTOWN.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.
FRIDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.
FRIDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
SATURDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.

WINDSOR WEST.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.
FRIDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.
FRIDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
SATURDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.

CHATHAM.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.
FRIDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.
FRIDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.
SATURDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.

SARNIA.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
FRIDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.
FRIDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
SATURDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.

PORT STANLEY.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
FRIDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
FRIDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
SATURDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.

LONDON.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
FRIDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.
FRIDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.
SATURDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.

GRAND BEND.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
FRIDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
FRIDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.
SATURDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.

TIVERTON
BARRIE
DORSET
PARRY SOUND
OTTAWA
GATINEAU
SAULT STE. MARIE.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
FRIDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.
FRIDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.
SATURDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.

BRANTFORD
KITCHENER
HAMILTON
HAMILTON DOWNTOWN
HAMILTON MOUNTAIN
HAMILTON WEST
BURLINGTON
OAKVILLE.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
FRIDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
FRIDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
SATURDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.

ST. CATHARINES.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.
FRIDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.
FRIDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
SATURDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.

OSHAWA
NEWMARKET.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
FRIDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
FRIDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
SATURDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.

PETERBOROUGH
BELLEVILLE
KINGSTON.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
FRIDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.
FRIDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.
SATURDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.

CORNWALL.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
FRIDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
FRIDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
SATURDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.

NORTH BAY
SUDBURY.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.
FRIDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.
FRIDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.
SATURDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.

THUNDER BAY.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.
FRIDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
FRIDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
SATURDAY..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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