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View reading for: 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
View reading for: 24-hr Sulphur Dioxide 24-hr PM10 24-hr PM2.5 8-hr Ozone 8-hr Carbon Monoxide 1-hr PM2.5 1-hr Nitrogen Dioxide
Note: a Sub-index for nitrogen dioxide is reported only when the 1-hr concentration equals or exceeds 1130 µg/m3. b There is no sub-index for 1-hr PM2.5.
Hourly updates of 3-hr PSI readings are provided from 7am to 11pm. The 3-hr PSI readings from 12am to 6am will be made available at 7am on the same day. The 3-hr PSI readings are calculated based on PM2.5 concentrations only.