FLCN21 CWTO 042146
AIR QUALITY HEALTH INDEX FORECAST FOR ONTARIO ISSUED JOINTLY BY
ENVIRONMENT CANADA AND THE PROVINCE OF ONTARIO AT 5:00 P.M. EST
WEDNESDAY 4 MARCH 2026 FOR TONIGHT THURSDAY AND FRIDAY.
THE NEXT SCHEDULED FORECAST WILL BE ISSUED AT 6:00 A.M. EST THURSDAY.

TORONTO
TORONTO EAST
TORONTO NORTH
TORONTO WEST
BURLINGTON
OAKVILLE
MISSISSAUGA
BRAMPTON.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 7 OR HIGH RISK.
THURSDAY..MAXIMUM AIR QUALITY HEALTH INDEX 4 OR MODERATE RISK.
THURSDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
FRIDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.

TORONTO DOWNTOWN.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 7 OR HIGH RISK.
THURSDAY..MAXIMUM AIR QUALITY HEALTH INDEX 5 OR MODERATE RISK.
THURSDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
FRIDAY..MAXIMUM AIR QUALITY HEALTH INDEX 4 OR MODERATE RISK.

WINDSOR
WINDSOR DOWNTOWN
WINDSOR WEST
SARNIA.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 4 OR MODERATE RISK.
THURSDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
THURSDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.
FRIDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.

CHATHAM
PORT STANLEY
GRAND BEND
TIVERTON.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
THURSDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
THURSDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
FRIDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.

LONDON
BRANTFORD
KITCHENER
GUELPH
ST. CATHARINES.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 4 OR MODERATE RISK.
THURSDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
THURSDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
FRIDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.

HAMILTON
HAMILTON WEST.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 7 OR HIGH RISK.
THURSDAY..MAXIMUM AIR QUALITY HEALTH INDEX 4 OR MODERATE RISK.
THURSDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
FRIDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.

HAMILTON DOWNTOWN
HAMILTON MOUNTAIN.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 7 OR HIGH RISK.
THURSDAY..MAXIMUM AIR QUALITY HEALTH INDEX 4 OR MODERATE RISK.
THURSDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
FRIDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.

MILTON.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 5 OR MODERATE RISK.
THURSDAY..MAXIMUM AIR QUALITY HEALTH INDEX 4 OR MODERATE RISK.
THURSDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
FRIDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.

OSHAWA
NEWMARKET
BARRIE.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 4 OR MODERATE RISK.
THURSDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
THURSDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
FRIDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.

PETERBOROUGH
BELLEVILLE
KINGSTON.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 4 OR MODERATE RISK.
THURSDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
THURSDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
FRIDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.

DORSET
PARRY SOUND
CORNWALL
OTTAWA
GATINEAU.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
THURSDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
THURSDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
FRIDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.

NORTH BAY
SUDBURY
SAULT STE. MARIE
THUNDER BAY.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
THURSDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
THURSDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
FRIDAY..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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