Table A11: 10 year Trend for O3 Summer Means (May - September)

Summer Mean (ppb)

Notes:
INS indicates there was insufficient data to calculate a valid summer mean.
Station 15026 replaced station 15025 as the London site in 2013.
Station 46108 replaced station 46109 as the Mississauga site in 2008.
Station 52023 replaced station 52022 as the Kingston site in 2014.
Station 77233 replaced station 77219 as the Sudbury site in 2013.

Table A12: 10 year Trend for O3 Winter Means (January-April, October-December)

Winter Mean (ppb)

Notes:
INS indicates there was insufficient data to calculate a valid winter mean.
Station 15026 replaced station 15025 as the London site in 2013.
Station 46108 replaced station 46109 as the Mississauga site in 2008.
Station 52023 replaced station 52022 as the Kingston site in 2014.
Station 77233 replaced station 77219 as the Sudbury site in 2013.

Ontario’s move to new measurement technology in 2013 has resulted in increased PM2.5 annual means; the increases are not an indication that the air quality has changed, but that the measurements are more accurate. For more information see Technical Discussion – New PM2.5 Measurement Technology in Ontario.

Table A13: 10 year Summary for PM2.5

Annual Mean (µg/m3)

Notes:
* For data comparison purposes, measurements were taken by Tapered Element Oscillating Microbalance (TEOM) sampler at selected sites. From 2004-2012, measurements taken by TEOM sampler operated at 30°C with a Sample Equilibration System (SES).
As of 2013, measurements taken by Synchronized Hybrid Ambient Real-time Particulate (SHARP) 5030.
Due to change in the PM2.5 monitoring method in 2013, it is inappropriate to calculate a change over time. n/a indicates pollutant not monitored.
INS indicates there was insufficient data in any one quarter to calculate a valid annual mean.
Station 15026 replaced station 15025 as the London site in 2013.
Station 46108 replaced station 46109 as the Mississauga site in 2008.
Station 52023 replaced station 52022 as the Kingston site in 2014.
Station 77233 replaced station 77219 as the Sudbury site in 2013.

Table A14: 10 year Trend for NO

Annual Mean (ppb)

Notes:
INS indicates there was insufficient data to calculate a valid annual mean.
rb indicates regional background measurements near detection limit of analyzer; trend is statistically insignificant.
Station 15026 replaced station 15025 as the London site in 2013.
Station 52023 replaced station 52022 as the Kingston site in 2014.

Table A15: 10 year Trend for NO2

Annual Mean (ppb)

Notes:
INS indicates there was insufficient data to calculate a valid annual mean.
n/a indicates data not available.
Station 15026 replaced station 15025 as the London site in 2013.
Station 52023 replaced station 52022 as the Kingston site in 2014.