London Mayor issues first â€˜highâ€™ air pollution warning for the capital since launch of awareness campaign in January
The London Mayorâ€™s first high air pollution warning of 2015 was issued this morning (March 17) and was aimed at residents and workers in the UK capital.
According to the London.gov.uk websiteâ€™s pollution forecast for today, London â€œcurrently has high levels of air pollutionâ€ and adults and children with lung problems and adults with heart problems are advised to â€œreduce strenuous physical exertion, particularly outdoors or if they experience symptomsâ€.
As well as issuing the standard government advice for pollution episodes, the Mayorâ€™s website also includes general advice and tips to help protect Londoners, such as car sharing and switching off car engines when not in use.
Earlier this year the Mayor, Boris Johnson, launched his â€˜Breathe Better Togetherâ€™ campaign, which seeks to raise awareness about air quality through posters and radio adverts and to encourage walking and cycling on less-polluted routes (see airqualitynews.com story).
In addition, the campaign also encourages Londoners to sign up to receive air pollution alerts on their mobile phones via the free service airTEXT, which issued Londoners with the high air pollution warning for today (March 17).
Simon Birkett, founder and director of campaign group Clean Air in London, congratulated the Mayor for issuing the warning, although he added that alerts should be issued â€œbefore the news cycle rather than after it begins and tweeting then himself to 1.2m followersâ€.
He also reiterated the governmentâ€™s health advice promoted by the Mayor that anyone experiencing discomfort should consider reducing activity, particularly outdoor, while at-risk individuals should take extra care.
Mr Birkett said: â€œWell done Boris for issuing his first high air pollution warning since launching his Breathe Better Together campaign on 30 January this year.
â€œThis episode, the third of the year so far, is being caused by collapsing wind speeds and a change in wind direction that is bringing in air from the continent that has passed over heavily urbanised and industrialised areas.Â Easterly winds look set to worsen the problem for West London as it gets smothered in everyoneâ€™s air pollution. Air pollution monitors across London are expected to report HIGH particle levels at roadside and perhaps some background locations later today.â€
Wind speeds turning northerly tonigh are expected to bring relief to the situation.
The London Air website, run by Kingâ€™s College London to provide air quality forecasts and â€˜nowcastsâ€™, yesterday (March 16) forecasted moderate levels of air pollution across the capital due to a slight change in the high pressure system in Europe taking air on a more southerly path through more urban and industrial areas.
The London Air website forecast states that wind speeds â€œwill also ease allowing local emissions to add to any imported pollutionâ€, adding that these low winds will â€œalso allow the build-up of nitrogen dioxide and â€˜moderateâ€™ is likely at busy roadside locations particularly during the morning rush hourâ€.
Furthermore, it adds that there is a chance of moderate particulate at all locations, although this is â€œmore likely at roadside locations where there may be a chance of â€˜highâ€™â€.
However, the KCL forecast expects nitrogen dioxide, ozone and sulphur dioxide levels to remain low at background locations throughout the period.
Nationally, Defra and Met Office pollution monitoring is showing only low and moderate levels of air pollution in the UK today and for the rest of the week.
According to the Defra forecast for today, due to â€œslack flow from the continentâ€, air pollution is expected to be moderate at times over southeast England and parts of East Anglia. In addition, locally sourced pockets of moderate air pollution are also expected over parts of east and northeast England due to light winds.
In the rest of the UK, pollution levels are forecasted to be low both today and tomorrow, although the forecast states that moderate air pollution is â€œpossible over south Wales, central and northern England, and Southeast Scotlandâ€.
However, the Met Office explains on its website that its forecast â€“ which is based on the information from Defraâ€™s monitoring network â€“ â€œdoes not represent the very localised increases in pollution that one might find close to roads in the urban environmentâ€ and instead â€œrepresents the background and regional air quality away from these strong sources of pollutionâ€.
This, the website states, is because the Met Office model â€œuses average emission maps and has grid boxes which are large compared to the road widthsâ€.