Air quality in London has ‘significantly improved’ since 2016


NEW data shows that air quality in some of London’s worst pollution hotspots has ‘significantly improved’ since 2016.

The figures reveal that during 2016, London’s air exceeded the hourly legal limit for nitrogen dioxide for over 4,000 hours.

Last year, this fell to just over 100 hours – a reduction of 97 per cent.

The Mayor of London, Sadiq Khan, commented on the findings: “Toxic air is a national health crisis contributing to thousands of premature deaths every year.

“I have taken bold action in London with measures such as the world’s first Ultra Low Emission Zone and Low Emission Bus Zones and it’s undeniable that these are making a difference to the air we breathe.

“We’re doing all we can in the capital, with proven results, so there are no excuses left for the Government’s failure to match our levels of ambition.”

Between 2004 to 2017 London breached the permitted number of exceedances for NO2 within the first week of the year.

In 2019 only one site breached and it did not occur until July.

There have also been significant reductions in Londoner’s long-term exposure to air pollution, with every monitoring site in the capital recording a reduction in annual average NO2 levels.

London-wide, there has been an average reduction of 21 per cent between 2016 and 2019.

Nitrogen dioxide is a toxic gas which aggravates respiratory diseases – particularly asthma – and stunts the development of children’s lungs.

Significant NO2 reductions have occurred where Low Emission Bus Zones have been introduced – areas where only buses that meet the cleanest emission standards can operate:

  • At Putney High Street in Wandsworth, NO2 levels have stayed within legal limits so far this year, compared to 1,279 hours of illegal levels in 2016.
  • At Brixton Road in Lambeth NO2 levels remained within legal limits for the entirety of 2019 and so far this year, compared to 530 hours above the legal limit in 2016. In 2017, this site saw London’s first breach of annual pollution limits just five days into the new year, and in 2018 it occurred within a month.
  • On Oxford Street in Westminster, NO2 exceeded legal limits for 168 hours in 2016. In 2019 monitors did not record a single hour above legal limits. However, there is also an annual average legal limit which Oxford Street did not meet, which is why further action is needed.

However, Mr Khan has stated there is still more work to do to make sure Londoners are breathing the cleanest possible air.

There are still many locations where pollution levels remain high – including for particulate matter – for example at the monitoring site in Vauxhall which preliminary research indicates may be being impacted by a nearby ventilation shaft from the Tube.

The Mayor is working with Transport for London to trial innovative new approaches to reduce pollution which is transported from the Tube network to the air above ground via ventilation systems.