Moderate ozone also affected the last 3 days of the Games.

On Friday 10th August ‘moderate’ ozone was measured across London, Sussex and Kent at a total of 18 monitoring sites. Late on Friday, the air feed reaching London shifted to transport pollution from the Low Countries.

Peak ozone concentrations on Saturday 11th August were similar to those on Friday 10th, but the arrival of air on a slightly more easterly path may have resulted in a change in the spatial distribution of elevated ozone, with greater concentrations recorded to the east of the capital, as opposed to the west on Friday. Twenty one sites across London and the southeast measured ‘moderate’ ozone.

‘Moderate’ ozone was measured at nine sites across the London and the southeast on Sunday the 12th August but pollution concentrations at the time of the Olympic marathon were ‘low’; a change to an Atlantic air flow caused a rapid decrease in concentrations during the mid-afternoon.

King's will continue to monitor air quality closely during the Paralympic Games and will produce episode analysis reports to members of the LAQN and the public as necessary.

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Item date 06/09/2012