yes a valuable presentation showing historical air cleaning then a recent rise in particulate due to .....
the 1997-2010 Labour government's environmental engineering via taxpayer subsidy (of diesel then wood pellet fuels)
these still having effects counter to those intended and proclaimed
the proclaimed intent was (nationally) to reduce carbon dioxide emissions and so bear down on climate change
the result was increased particulate emissions
the RHI was finally capped c.2020 but the subsidised (wood-burning) emission increase will continue for c.23 years
75% of London's public air particulate now is from wood-fired heating that was govt-promoted as 'greener' than gas
and of course this heating also pollutes the air inside the owner's home
this government was obsessed with carbon dioxide reduction because their vanity idea was to out-green Germany ...
by staggering incompetence they mistakenly agreed to a big % reduction of carbon emission from all sources thinking ....
they were agreeing to that big % reduction of carbon emission from electrical energy only ... so....
thereafter they were desperate for carbon reduction regardless of environmental cost
the prime desparado was/is the then-Chief Scientific Adviser the (now-knighted) Sir David King .... so ...
that's why he said/says the dieselgate baddies 'have blood on their hands'
vanity and desperation continue in driving all these 'net zero' proclamations
the (city) government of London is Labour - today it hounds the car driver to cover up its party's 'green' mistakes