It comes after a draft report leaked by The Sunday Telegraph showed an investigation was launched by watchdog the Advertising Standards Authority (ASA) earlier this year after hundreds of people complained TfL had exaggerated the extent to which the scheme had improved air quality.
The ASA draft report criticizes misleading claims made about reducing levels of nitrogen dioxide (NO2) in TfL's radio and newspaper advertisements.
TfL spent millions of pounds on marketing ahead of expanding the ULEZ to cover the whole of the capital from August 29. Mayor of London Sadiq Khan chairs TfL and it is understood the Mayor's office will strongly reject any suggestion the adverts were misleading.
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