FLCN21 CWTO 042045
AIR QUALITY HEALTH INDEX FORECAST FOR ONTARIO ISSUED JOINTLY BY
ENVIRONMENT CANADA AND THE PROVINCE OF ONTARIO AT 5:00 P.M. EDT
MONDAY 4 MAY 2026 FOR TONIGHT TUESDAY AND WEDNESDAY.
THE NEXT SCHEDULED FORECAST WILL BE ISSUED AT 6:00 A.M. EDT TUESDAY.

TORONTO
TORONTO DOWNTOWN
TORONTO EAST
TORONTO NORTH
TORONTO WEST
ST. CATHARINES
HAMILTON
HAMILTON DOWNTOWN
HAMILTON MOUNTAIN
HAMILTON WEST
BURLINGTON
OAKVILLE
MILTON
MISSISSAUGA
BRAMPTON.
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 3 OR LOW RISK.

WINDSOR
WINDSOR DOWNTOWN
WINDSOR WEST
CHATHAM
PORT STANLEY
LONDON
BRANTFORD.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 4 OR MODERATE 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
GRAND BEND
TIVERTON
KITCHENER
GUELPH.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 4 OR MODERATE 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.

OSHAWA
PETERBOROUGH
BELLEVILLE.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 4 OR MODERATE 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
BARRIE
DORSET
PARRY SOUND.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 4 OR MODERATE 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
CORNWALL
OTTAWA
GATINEAU.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 4 OR MODERATE 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.

NORTH BAY
SUDBURY
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

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