Is there really an "air pollution crisis" in UK cities requiring new taxes, limits & restrictions?

Is there really an "air pollution crisis" in UK cities only answerable with new taxes, limits & restrictions - as politicians like Mayor of London, Sadiq Khan claim?

In this video, Ben Pile of Climate Debate UK breaks down how unscientific, alarmist claims are used to justify anti-mobility policies very likely to do more harm than good.