Ozone (2)

MQT on 2017-09-14
Session date: 
September 14, 2017
Question By: 
David Kurten
Asked Of: 
The Mayor


In your opinion, what contribution does ozone make to climate change and global warming? Do you understand that, unlike carbon dioxide, ozone's absorption band in the infra-red spectrum is unsaturated, meaning an increase in tropospheric ozone will have a far greater impact on infra-red absorption than carbon dioxide?


Answer for Ozone (2)

Answer for Ozone (2)

Answered By: 
The Mayor

Tropospheric ozone is a secondary air pollutant and it is particularly difficult to assess its greenhouse gas potential due to its short lifespan, compared to other greenhouse gasses, and the fact that ozone concentrations can vary highly from place to place. It can act both as a direct greenhouse gas as well as reducing the global warming potential of other greenhouse gasses.

Ozone is a not directly emitted by human activity and as a secondary pollutant it is not recorded in London's Energy and Greenhouse Gas Inventory or the London Atmospheric Emissions Inventory as these only calculate direct emissions. Ozone is measured at a number of locations in London and data can be viewed on the London Air Quality Network website or through monthly reports on the London datastore.

I refer you to MQ 2017/3533 for London's compliance with legal limits for ozone.