Green Party: this is why emission problem is urgent

The Green Party has published this picture, claiming that is shows "why we need a very low emission zone for central London ASAP, not in 2020".

It is a map of nitrogen dioxide (NO2) pollution in the congestion charging zone, put together by Assembly Member Jenny Jones.

It is based on NO2 emissions modelling carried out by Kings College London, not on actual readings.

Map of nitrogen dioxide pollution in the congestion zone. Credit: Green Party

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Ultra-low emission zone

All vehicles driving in central London during business hours will have to be zero or low-emission, under new plans for an ultra-low emission zone.