Conservative politicians have been left furious at Mayor of London Sadiq Khan's "impossible" environment strategy.

The plan includes ensuring London as the best air quality in any major city by 2050, and calling on the government to ensure all new cars and vans driven in the city will be zero emission by 2030 at the latest.

It was approved this week - but not everybody believes the plan is a realistic one.

Shaun Bailey, Conservative assembly member, criticised targets such as these for being too far into the future and said that during the time in the run-up to the targets there was “no real metrics in between” to measure parts of the strategy.

He said: “It is impossible to carry out this work with a complete lack of metrics.

Mr Bailey added: “We must challenge the mayor to give us more detail.

“If you support this strategy then you are against the work of the London assembly.”

UKIP assembly member David Kurten was also in favour of rejecting the mayor’s draft environment strategy and backed Mr Bailey’s comments on the time limits set by the mayor for his proposals.

Caroline Russell who spoke on behalf of the Green party praised most of the strategy.

But she said the Ultra Low Emissions Zone (ULEZ) should cover the whole of London in this Mayoral term.

The proposed (ULEZ) will form a protected area in which most vehicles will need to meet exhaust emission standards or pay a daily charge.

The ULEZ will begin in April 2019 covering all of central London and the draft environment strategy proposes to extend that zone to the North and South Circular Roads from October 2021 onwards.

The ULEZ has been contraversial, in Chingford, where residents will need to pay £12.50 to drive to their local hospital, Whipps Cross in Leytonstone, or the other side of the North Circular Road.

Ms Russell said: “We absolutely have sympathy with this motion and we think they mayor needs to have much stronger interim targets but we don’t want to slow down very good work in the strategy so we’re going to abstain from voting against the strategy.”

Leonie Cooper, Labour London assembly member, backed the draft environment strategy although she did say that there may be more needed to be done to monitor the strategy over the next few years.

Addressing assembly members before the final vote she said: “I think we should be supporting and not rejecting this strategy, please reject this amendment from Shaun Bailey and Gareth Bacon.”

In the final vote 13 members voted to adopt the mayor’s draft strategy and 10 voted to reject it.

The Conservative and UKIP assembly members voted against adopting the strategy whilst the other parties voted in favour of adopting it.