FLCN21 CWTO 041050
AIR QUALITY HEALTH INDEX FORECAST FOR ONTARIO ISSUED JOINTLY BY
ENVIRONMENT CANADA AND THE PROVINCE OF ONTARIO AT 6:00 A.M. EST
WEDNESDAY 4 MARCH 2026 FOR TODAY AND THURSDAY.
THE NEXT SCHEDULED FORECAST WILL BE ISSUED AT 5:00 P.M. EST.

TORONTO
TORONTO EAST
TORONTO NORTH
TORONTO WEST.
TODAY..MAXIMUM AIR QUALITY HEALTH INDEX 6 OR MODERATE RISK.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 6 OR MODERATE RISK.
THURSDAY..MAXIMUM AIR QUALITY HEALTH INDEX 5 OR MODERATE RISK.
THURSDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 4 OR MODERATE RISK.

TORONTO DOWNTOWN.
TODAY..MAXIMUM AIR QUALITY HEALTH INDEX 7 OR HIGH RISK.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 6 OR MODERATE RISK.
THURSDAY..MAXIMUM AIR QUALITY HEALTH INDEX 5 OR MODERATE RISK.
THURSDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 4 OR MODERATE RISK.

WINDSOR
WINDSOR DOWNTOWN
WINDSOR WEST
SARNIA
KITCHENER
PETERBOROUGH
BELLEVILLE
KINGSTON
CORNWALL.
TODAY..MAXIMUM AIR QUALITY HEALTH INDEX 4 OR MODERATE RISK.
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.

CHATHAM
PORT STANLEY
GRAND BEND
TIVERTON
BRANTFORD.
TODAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
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 2 OR LOW RISK.

LONDON
MILTON.
TODAY..MAXIMUM AIR QUALITY HEALTH INDEX 5 OR MODERATE RISK.
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.

GUELPH
HAMILTON
HAMILTON DOWNTOWN
HAMILTON MOUNTAIN
HAMILTON WEST
BURLINGTON.
TODAY..MAXIMUM AIR QUALITY HEALTH INDEX 4 OR MODERATE RISK.
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.

ST. CATHARINES.
TODAY..MAXIMUM AIR QUALITY HEALTH INDEX 4 OR MODERATE RISK.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
THURSDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.
THURSDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.

OAKVILLE
MISSISSAUGA
BRAMPTON.
TODAY..MAXIMUM AIR QUALITY HEALTH INDEX 5 OR MODERATE RISK.
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 4 OR MODERATE RISK.

OSHAWA
NEWMARKET.
TODAY..MAXIMUM AIR QUALITY HEALTH INDEX 4 OR MODERATE RISK.
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.

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

DORSET
PARRY SOUND
NORTH BAY
SUDBURY
SAULT STE. MARIE
THUNDER BAY.
TODAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
THURSDAY..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.
THURSDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW RISK.

OTTAWA
GATINEAU.
TODAY..MAXIMUM AIR QUALITY HEALTH INDEX 5 OR MODERATE RISK.
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.

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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