Investigating the background and local contribution of the oxidants in London and Bangkok.

The contribution of NO emissions and background O to the sources and partitioning of the oxidants [OX (= O + NO)] at the Marylebone Road site in London during the 2000s and 2010s has been investigated to see the impact of the control measures or technology changes inline with the London Mayor's Air Quality Strategy. The abatement of the pollution emissions has an impact on the trends of local and background oxidants, [OX] and [OX], decreasing by 1.4% per year and 0.