Share of cars with unknown CO2 emission figures in Great Britain 2001-2016

This statistic illustrates the percentage of the total licensed cars in Great Britain between 2001 and 2016, for which the levels of carbon dioxide emissions are not known. Prior to 2001, vehicle excise duty for cars was based on engine size, but has since been revised to reflect carbon dioxide emission levels. This can explain the reduction in the proportion of cars with unknown emission levels, because all cars that have been registered since 2001 must specify an approximate carbon dioxide emission level.

Percentage of licensed cars with unknown levels of carbon dioxide emissions in Great Britain from 2001 to 2016

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Release date

April 2017


United Kingdom (Great Britain)

Survey time period

2001 to 2016

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Statistics on "Transport emissions in the UK"

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