Toronto Downtown: AQI for 2011

Date Time AQI Category Cause
Dec-31-114:00 pm EST7
Fine Particulate Matter PM2.5
Dec-30-114:00 pm EST9
Ozone O3
Dec-29-114:00 pm EST15
Ozone O3
Dec-28-114:00 pm EST20
Ozone O3
Dec-27-114:00 pm EST12
Ozone O3
Dec-26-114:00 pm EST18
Ozone O3
Dec-25-114:00 pm EST12
Ozone O3
Dec-24-114:00 pm EST17
Ozone O3
Dec-23-114:00 pm EST18
Ozone O3
Dec-22-114:00 pm EST10
Ozone O3
Dec-21-114:00 pm EST10
Fine Particulate Matter PM2.5
Dec-20-114:00 pm EST12
Ozone O3
Dec-19-114:00 pm EST14
Fine Particulate Matter PM2.5
Dec-18-114:00 pm EST10
Ozone O3
Dec-17-114:00 pm EST18
Ozone O3
Dec-16-114:00 pm EST10
Ozone O3
Dec-15-114:00 pm EST10
Ozone O3
Dec-14-114:00 pm EST18
Fine Particulate Matter PM2.5
Dec-13-114:00 pm EST27
Fine Particulate Matter PM2.5
Dec-12-114:00 pm EST14
Ozone O3
Dec-11-114:00 pm EST20
Ozone O3
Dec-10-114:00 pm EST21
Ozone O3
Dec-09-114:00 pm EST10
Ozone O3
Dec-08-114:00 pm EST16
Ozone O3
Dec-07-114:00 pm EST11
Ozone O3
Dec-06-114:00 pm EST5
Nitrogen Dioxide NO2
Dec-05-114:00 pm EST5
Nitrogen Dioxide NO2
Dec-04-114:00 pm EST15
Ozone O3
Dec-03-114:00 pm EST11
Ozone O3
Dec-02-114:00 pm EST12
Ozone O3
Dec-01-114:00 pm EST11
Ozone O3
Nov-30-114:00 pm EST18
Ozone O3
Nov-29-114:00 pm EST6
Ozone O3
Nov-28-114:00 pm EST7
Nitrogen Dioxide NO2
Nov-27-114:00 pm EST18
Ozone O3
Nov-26-114:00 pm EST20
Ozone O3
Nov-25-114:00 pm EST18
Ozone O3
Nov-24-114:00 pm EST14
Fine Particulate Matter PM2.5
Nov-23-114:00 pm EST16
Ozone O3
Nov-22-114:00 pm EST17
Ozone O3
Nov-21-114:00 pm EST17
Ozone O3
Nov-20-114:00 pm EST11
Ozone O3
Nov-19-114:00 pm EST21
Ozone O3
Nov-18-114:00 pm EST17
Ozone O3
Nov-17-114:00 pm EST15
Ozone O3
Nov-16-114:00 pm EST20
Ozone O3
Nov-15-114:00 pm EST14
Fine Particulate Matter PM2.5
Nov-14-114:00 pm EST10
Nitrogen Dioxide NO2
Nov-13-114:00 pm EST25
Ozone O3
Nov-12-114:00 pm EST20
Ozone O3
Nov-11-114:00 pm EST16
Ozone O3
Nov-10-114:00 pm EST18
Ozone O3
Nov-09-114:00 pm EST9
Ozone O3
Nov-08-114:00 pm EST17
Fine Particulate Matter PM2.5
Nov-07-114:00 pm EST16
Fine Particulate Matter PM2.5
Nov-06-114:00 pm EST22
Ozone O3
Nov-05-114:00 pm EDT18
Ozone O3
Nov-04-114:00 pm EDT18
Ozone O3
Nov-03-114:00 pm EDT8
Ozone O3
Nov-02-114:00 pm EDT20
Ozone O3
Nov-01-114:00 pm EDT17
Fine Particulate Matter PM2.5
Oct-31-114:00 pm EDT14
Ozone O3
Oct-30-114:00 pm EDT20
Ozone O3
Oct-29-114:00 pm EDT14
Ozone O3
Oct-28-114:00 pm EDT8
Ozone O3
Oct-27-114:00 pm EDT10
Ozone O3
Oct-26-114:00 pm EDT7
Ozone O3
Oct-25-114:00 pm EDT10
Ozone O3
Oct-24-114:00 pm EDT22
Ozone O3
Oct-23-114:00 pm EDT18
Fine Particulate Matter PM2.5
Oct-22-114:00 pm EDT18
Ozone O3
Oct-21-114:00 pm EDT8
Ozone O3
Oct-20-114:00 pm EDT5
Ozone O3
Oct-19-114:00 pm EDT10
Ozone O3
Oct-18-114:00 pm EDT12
Ozone O3
Oct-17-114:00 pm EDT16
Ozone O3
Oct-16-114:00 pm EDT13
Ozone O3
Oct-15-114:00 pm EDT11
Ozone O3
Oct-14-114:00 pm EDT17
Ozone O3
Oct-13-114:00 pm EDT13
Ozone O3
Oct-12-114:00 pm EDT12
Ozone O3
Oct-11-114:00 pm EDT27
Ozone O3
Oct-10-114:00 pm EDT45
Ozone O3
Oct-09-114:00 pm EDT40
Ozone O3
Oct-08-114:00 pm EDT31
Ozone O3
Oct-07-114:00 pm EDT22
Ozone O3
Oct-06-114:00 pm EDT18
Ozone O3
Oct-05-114:00 pm EDT17
Ozone O3
Oct-04-114:00 pm EDT15
Ozone O3
Oct-03-114:00 pm EDT3
Fine Particulate Matter PM2.5
Oct-02-114:00 pm EDT8
Ozone O3
Oct-01-114:00 pm EDT19
Ozone O3
Sep-30-114:00 pm EDT20
Ozone O3
Sep-29-114:00 pm EDT27
Ozone O3
Sep-28-114:00 pm EDT23
Ozone O3
Sep-27-114:00 pm EDT28
Ozone O3
Sep-26-114:00 pm EDT24
Ozone O3
Sep-25-114:00 pm EDT28
Ozone O3
Sep-24-114:00 pm EDT29
Ozone O3
Sep-23-114:00 pm EDT19
Ozone O3
Sep-22-114:00 pm EDT22
Ozone O3
Sep-21-114:00 pm EDT18
Fine Particulate Matter PM2.5
Sep-20-114:00 pm EDT21
Ozone O3
Sep-19-114:00 pm EDT12
Ozone O3
Sep-18-114:00 pm EDT25
Ozone O3
Sep-17-114:00 pm EDT21
Ozone O3
Sep-16-114:00 pm EDT18
Ozone O3
Sep-15-114:00 pm EDT17
Ozone O3
Sep-14-114:00 pm EDT20
Ozone O3
Sep-13-114:00 pm EDT23
Fine Particulate Matter PM2.5
Sep-12-114:00 pm EDT33
Ozone O3
Sep-11-114:00 pm EDT20
Fine Particulate Matter PM2.5
Sep-10-114:00 pm EDT17
Ozone O3
Sep-09-114:00 pm EDT22
Ozone O3
Sep-08-114:00 pm EDT20
Ozone O3
Sep-07-114:00 pm EDT18
Ozone O3
Sep-06-114:00 pm EDT9
Ozone O3
Sep-05-114:00 pm EDT10
Ozone O3
Sep-04-114:00 pm EDT30
Ozone O3
Sep-03-114:00 pm EDT38
Ozone O3
Sep-02-114:00 pm EDT35
Ozone O3
Sep-01-114:00 pm EDT33
Ozone O3
Aug-31-114:00 pm EDT32
Ozone O3
Aug-30-114:00 pm EDT30
Ozone O3
Aug-29-114:00 pm EDT20
Ozone O3
Aug-28-114:00 pm EDT14
Ozone O3
Aug-27-114:00 pm EDT33
Ozone O3
Aug-26-114:00 pm EDT12
Ozone O3
Aug-25-114:00 pm EDT13
Ozone O3
Aug-24-114:00 pm EDT35
Ozone O3
Aug-23-114:00 pm EDT29
Ozone O3
Aug-22-114:00 pm EDT16
Ozone O3
Aug-21-114:00 pm EDT22
Ozone O3
Aug-20-114:00 pm EDT35
Ozone O3
Aug-19-114:00 pm EDT29
Ozone O3
Aug-18-114:00 pm EDT38
Ozone O3
Aug-17-114:00 pm EDT31
Ozone O3
Aug-16-114:00 pm EDT34
Ozone O3
Aug-15-114:00 pm EDT20
Ozone O3
Aug-14-114:00 pm EDT35
Ozone O3
Aug-13-114:00 pm EDT33
Ozone O3
Aug-12-114:00 pm EDT29
Ozone O3
Aug-11-114:00 pm EDT20
Ozone O3
Aug-10-114:00 pm EDT14
Ozone O3
Aug-09-114:00 pm EDT18
Ozone O3
Aug-08-114:00 pm EDTN/ANot AvailableNot Available N/A
Aug-07-114:00 pm EDT37
Ozone O3
Aug-06-114:00 pm EDT32
Ozone O3
Aug-05-114:00 pm EDT25
Ozone O3
Aug-04-114:00 pm EDT20
Ozone O3
Aug-03-114:00 pm EDT14
Ozone O3
Aug-02-114:00 pm EDT36
Ozone O3
Aug-01-114:00 pm EDT25
Ozone O3
Jul-31-114:00 pm EDT32
Ozone O3
Jul-30-114:00 pm EDT38
Ozone O3
Jul-29-114:00 pm EDT28
Ozone O3
Jul-28-114:00 pm EDT20
Ozone O3
Jul-27-114:00 pm EDT33
Ozone O3
Jul-26-114:00 pm EDT18
Ozone O3
Jul-25-114:00 pm EDT19
Ozone O3
Jul-24-114:00 pm EDT15
Ozone O3
Jul-23-114:00 pm EDT45
Ozone O3
Jul-22-114:00 pm EDT41
Ozone O3
Jul-21-114:00 pm EDT36
Ozone O3
Jul-20-114:00 pm EDT41
Ozone O3
Jul-19-114:00 pm EDT18
Ozone O3
Jul-18-114:00 pm EDT47
Fine Particulate Matter PM2.5
Jul-17-114:00 pm EDT47
Ozone O3
Jul-16-114:00 pm EDT33
Ozone O3
Jul-15-114:00 pm EDT18
Ozone O3
Jul-14-114:00 pm EDT18
Ozone O3
Jul-13-114:00 pm EDT19
Ozone O3
Jul-12-114:00 pm EDT25
Ozone O3
Jul-11-114:00 pm EDT41
Ozone O3
Jul-10-114:00 pm EDT39
Ozone O3
Jul-09-114:00 pm EDT22
Ozone O3
Jul-08-114:00 pm EDT29
Ozone O3
Jul-07-114:00 pm EDT17
Ozone O3
Jul-06-114:00 pm EDT33
Ozone O3
Jul-05-114:00 pm EDT32
Ozone O3
Jul-04-114:00 pm EDT25
Ozone O3
Jul-03-114:00 pm EDT25
Ozone O3
Jul-02-114:00 pm EDT36
Ozone O3
Jul-01-114:00 pm EDT24
Ozone O3
Jun-30-114:00 pm EDT31
Ozone O3
Jun-29-114:00 pm EDT20
Ozone O3
Jun-28-114:00 pm EDT31
Ozone O3
Jun-27-114:00 pm EDT29
Ozone O3
Jun-26-114:00 pm EDT20
Ozone O3
Jun-25-114:00 pm EDT17
Ozone O3
Jun-24-114:00 pm EDT17
Ozone O3
Jun-23-114:00 pm EDT28
Ozone O3
Jun-22-114:00 pm EDT18
Ozone O3
Jun-21-114:00 pm EDT27
Ozone O3
Jun-20-114:00 pm EDT24
Ozone O3
Jun-19-114:00 pm EDT20
Ozone O3
Jun-18-114:00 pm EDT40
Ozone O3
Jun-17-114:00 pm EDT31
Fine Particulate Matter PM2.5
Jun-16-114:00 pm EDT38
Ozone O3
Jun-15-114:00 pm EDT28
Ozone O3
Jun-14-114:00 pm EDT19
Ozone O3
Jun-13-114:00 pm EDT11
Ozone O3
Jun-12-114:00 pm EDT21
Ozone O3
Jun-11-114:00 pm EDT24
Ozone O3
Jun-10-114:00 pm EDT18
Ozone O3
Jun-09-114:00 pm EDT36
Ozone O3
Jun-08-114:00 pm EDT45
Ozone O3
Jun-07-114:00 pm EDT42
Ozone O3
Jun-06-114:00 pm EDT29
Ozone O3
Jun-05-114:00 pm EDT29
Ozone O3
Jun-04-114:00 pm EDT28
Ozone O3
Jun-03-114:00 pm EDT31
Ozone O3
Jun-02-114:00 pm EDT30
Ozone O3
Jun-01-114:00 pm EDT31
Ozone O3
May-31-114:00 pm EDT40
Fine Particulate Matter PM2.5
May-30-114:00 pm EDT34
Ozone O3
May-29-114:00 pm EDT29
Fine Particulate Matter PM2.5
May-28-114:00 pm EDT19
Ozone O3
May-27-114:00 pm EDT13
Ozone O3
May-26-114:00 pm EDT25
Ozone O3
May-25-114:00 pm EDT20
Ozone O3
May-24-114:00 pm EDT14
Ozone O3
May-23-114:00 pm EDT32
Ozone O3
May-22-114:00 pm EDT21
Ozone O3
May-21-114:00 pm EDT23
Ozone O3
May-20-114:00 pm EDT20
Ozone O3
May-19-114:00 pm EDT23
Ozone O3
May-18-114:00 pm EDT20
Ozone O3
May-17-114:00 pm EDT7
Ozone O3
May-16-114:00 pm EDT18
Ozone O3
May-15-114:00 pm EDT19
Ozone O3
May-14-114:00 pm EDT14
Ozone O3
May-13-114:00 pm EDT38
Ozone O3
May-12-114:00 pm EDT25
Ozone O3
May-11-114:00 pm EDT26
Ozone O3
May-10-114:00 pm EDT27
Ozone O3
May-09-114:00 pm EDT22
Ozone O3
May-08-114:00 pm EDT22
Ozone O3
May-07-114:00 pm EDT28
Ozone O3
May-06-114:00 pm EDT28
Ozone O3
May-05-114:00 pm EDT32
Ozone O3
May-04-114:00 pm EDT21
Ozone O3
May-03-114:00 pm EDT8
Ozone O3
May-02-114:00 pm EDT16
Ozone O3
May-01-114:00 pm EDT21
Ozone O3
Apr-30-114:00 pm EDT23
Ozone O3
Apr-29-114:00 pm EDT21
Ozone O3
Apr-28-114:00 pm EDT18
Ozone O3
Apr-27-114:00 pm EDT23
Ozone O3
Apr-26-114:00 pm EDT22
Ozone O3
Apr-25-114:00 pm EDT17
Ozone O3
Apr-24-114:00 pm EDT21
Ozone O3
Apr-23-114:00 pm EDT31
Ozone O3
Apr-22-114:00 pm EDT29
Ozone O3
Apr-21-114:00 pm EDT29
Ozone O3
Apr-20-114:00 pm EDT20
Ozone O3
Apr-19-114:00 pm EDT22
Ozone O3
Apr-18-114:00 pm EDT21
Ozone O3
Apr-17-114:00 pm EDT27
Ozone O3
Apr-16-114:00 pm EDT25
Ozone O3
Apr-15-114:00 pm EDT25
Ozone O3
Apr-14-114:00 pm EDT27
Ozone O3
Apr-13-114:00 pm EDT19
Ozone O3
Apr-12-114:00 pm EDT25
Ozone O3
Apr-11-114:00 pm EDT25
Ozone O3
Apr-10-114:00 pm EDT20
Ozone O3
Apr-09-114:00 pm EDT33
Ozone O3
Apr-08-114:00 pm EDT25
Ozone O3
Apr-07-114:00 pm EDT20
Fine Particulate Matter PM2.5
Apr-06-114:00 pm EDT22
Ozone O3
Apr-05-114:00 pm EDT28
Ozone O3
Apr-04-114:00 pm EDT20
Ozone O3
Apr-03-114:00 pm EDT31
Ozone O3
Apr-02-114:00 pm EDT33
Ozone O3
Apr-01-114:00 pm EDT32
Ozone O3
Mar-31-114:00 pm EDT22
Ozone O3
Mar-30-114:00 pm EDT28
Ozone O3
Mar-29-114:00 pm EDT28
Ozone O3
Mar-28-114:00 pm EDT28
Ozone O3
Mar-27-114:00 pm EDT28
Ozone O3
Mar-26-114:00 pm EDT25
Ozone O3
Mar-25-114:00 pm EDT28
Ozone O3
Mar-24-114:00 pm EDT24
Ozone O3
Mar-23-114:00 pm EDT21
Ozone O3
Mar-22-114:00 pm EDT23
Ozone O3
Mar-21-114:00 pm EDT21
Ozone O3
Mar-20-114:00 pm EDT25
Ozone O3
Mar-19-114:00 pm EDT27
Ozone O3
Mar-18-114:00 pm EDT28
Ozone O3
Mar-17-114:00 pm EDT26
Ozone O3
Mar-16-114:00 pm EDT17
Ozone O3
Mar-15-114:00 pm EDT24
Ozone O3
Mar-14-114:00 pm EDT17
Ozone O3
Mar-13-114:00 pm EDT22
Ozone O3
Mar-12-114:00 pm EST17
Ozone O3
Mar-11-114:00 pm EST20
Ozone O3
Mar-10-114:00 pm EST15
Ozone O3
Mar-09-114:00 pm EST22
Ozone O3
Mar-08-114:00 pm EST26
Ozone O3
Mar-07-114:00 pm EST26
Ozone O3
Mar-06-114:00 pm EST22
Ozone O3
Mar-05-114:00 pm EST20
Ozone O3
Mar-04-114:00 pm EST18
Fine Particulate Matter PM2.5
Mar-03-114:00 pm EST20
Ozone O3
Mar-02-114:00 pm EST25
Ozone O3
Mar-01-114:00 pm EST26
Ozone O3
Feb-28-114:00 pm EST26
Ozone O3
Feb-27-114:00 pm EST20
Fine Particulate Matter PM2.5
Feb-26-114:00 pm EST21
Ozone O3
Feb-25-114:00 pm EST21
Ozone O3
Feb-24-114:00 pm EST30
Fine Particulate Matter PM2.5
Feb-23-114:00 pm EST25
Ozone O3
Feb-22-114:00 pm EST20
Fine Particulate Matter PM2.5
Feb-21-114:00 pm EST23
Ozone O3
Feb-20-114:00 pm EST21
Ozone O3
Feb-19-114:00 pm EST24
Ozone O3
Feb-18-114:00 pm EST23
Ozone O3
Feb-17-114:00 pm EST28
Fine Particulate Matter PM2.5
Feb-16-114:00 pm EST22
Fine Particulate Matter PM2.5
Feb-15-114:00 pm EST15
Ozone O3
Feb-14-114:00 pm EST24
Ozone O3
Feb-13-114:00 pm EST31
Ozone O3
Feb-12-114:00 pm EST25
Ozone O3
Feb-11-114:00 pm EST21
Ozone O3
Feb-10-114:00 pm EST24
Ozone O3
Feb-09-114:00 pm EST22
Ozone O3
Feb-08-114:00 pm EST23
Ozone O3
Feb-07-114:00 pm EST19
Fine Particulate Matter PM2.5
Feb-06-114:00 pm EST21
Ozone O3
Feb-05-114:00 pm ESTN/ANot AvailableNot Available N/A
Feb-04-114:00 pm EST17
Ozone O3
Feb-03-114:00 pm EST22
Ozone O3
Feb-02-114:00 pm EST19
Ozone O3
Feb-01-114:00 pm EST17
Ozone O3
Jan-31-114:00 pm EST16
Ozone O3
Jan-30-114:00 pm EST20
Ozone O3
Jan-29-114:00 pm EST13
Ozone O3
Jan-28-114:00 pm EST26
Fine Particulate Matter PM2.5
Jan-27-114:00 pm EST18
Ozone O3
Jan-26-114:00 pm EST17
Fine Particulate Matter PM2.5
Jan-25-114:00 pm EST18
Ozone O3
Jan-24-114:00 pm EST17
Ozone O3
Jan-23-114:00 pm EST20
Ozone O3
Jan-22-114:00 pm EST17
Ozone O3
Jan-21-114:00 pm EST20
Ozone O3
Jan-20-114:00 pm EST20
Ozone O3
Jan-19-114:00 pm EST9
Nitrogen Dioxide NO2
Jan-18-114:00 pm EST10
Fine Particulate Matter PM2.5
Jan-17-114:00 pm EST21
Ozone O3
Jan-16-114:00 pm EST26
Ozone O3
Jan-15-114:00 pm EST15
Fine Particulate Matter PM2.5
Jan-14-114:00 pm EST15
Ozone O3
Jan-13-114:00 pm EST14
Ozone O3
Jan-12-114:00 pm EST19
Ozone O3
Jan-11-114:00 pm EST16
Ozone O3
Jan-10-114:00 pm EST20
Ozone O3
Jan-09-114:00 pm EST21
Ozone O3
Jan-08-114:00 pm EST15
Ozone O3
Jan-07-114:00 pm EST15
Ozone O3
Jan-06-114:00 pm EST12
Fine Particulate Matter PM2.5
Jan-05-114:00 pm EST22
Ozone O3
Jan-04-114:00 pm EST8
Ozone O3
Jan-03-114:00 pm EST18
Ozone O3
Jan-02-114:00 pm EST17
Ozone O3
Jan-01-114:00 pm EST20
Ozone O3

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Air Quality Index (AQI) Categories

AQI Colour
0-15 Very Good Very Good
16-31 Good Good
32-49 Moderate Moderate
50-99 Poor Poor
100+ Very Poor Very Poor

AQI readings on this web page are based on automatically polled data and have not undergone final verification.

 

 
 

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