FLCN21 CWTO 202045
AIR QUALITY HEALTH INDEX FORECAST FOR ONTARIO ISSUED JOINTLY BY
ENVIRONMENT CANADA AND THE PROVINCE OF ONTARIO AT 5:00 P.M. EDT
MONDAY 20 APRIL 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.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 4 OR MODERATE RISK.
TUESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 4 OR MODERATE RISK.
TUESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 4 OR MODERATE RISK.
WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 4 OR MODERATE RISK.

WINDSOR
WINDSOR DOWNTOWN
WINDSOR WEST
CHATHAM
SARNIA
PORT STANLEY
LONDON
GRAND BEND
TIVERTON.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW 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.

BRANTFORD
KITCHENER
GUELPH
MILTON
BRAMPTON
OSHAWA
NEWMARKET
BARRIE
PETERBOROUGH
DORSET
BELLEVILLE
KINGSTON
CORNWALL
OTTAWA
GATINEAU
SUDBURY.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW 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.

ST. CATHARINES.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW 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.

HAMILTON
HAMILTON DOWNTOWN
HAMILTON MOUNTAIN
HAMILTON WEST
BURLINGTON
OAKVILLE
MISSISSAUGA.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
TUESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.
TUESDAY NIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 4 OR MODERATE RISK.
WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 4 OR MODERATE RISK.

PARRY SOUND.
TONIGHT..MAXIMUM AIR QUALITY HEALTH INDEX 2 OR LOW 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.

NORTH 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 3 OR LOW RISK.
WEDNESDAY..MAXIMUM AIR QUALITY HEALTH INDEX 3 OR LOW RISK.

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 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.

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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