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23 February 2019
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The £250k programme is funded by the Mayor's Air Quality Fund © iStock

5 December 2018 | Herpreet Kaur Grewal

The Mayor of London has launched a programme of air quality audits to help clean up toxic air and protect the health of young children at nurseries in some of the most polluted parts of the capital. 


The audits will target sources of indoor and outdoor pollution, with five of the 20 nurseries trialling new air filtration systems to test their effectiveness at reducing indoor pollution. They will focus on reducing NO2, PM10 and PM 2.5 as research shows that children exposed to these smaller pollution particles and gases are more likely to grow up with lung problems and to develop asthma. 


The scheme follows 50 successful audits the mayor delivered to primary schools earlier this year, which have already led to some schools taking action to close roads, upgrade their boilers, tackle engine idling and promote car-sharing schemes. 


A recent study by University College London and the University of Cambridge, funded by the mayor, shows that indoor air pollution is significantly higher inside classrooms owing to a range of factors including the age of buildings, ventilation, positioning of windows, and wall-to-wall carpeting.   


The findings suggest that the protection offered by the building increases the farther away it was from the busiest roads and that airtight buildings could offer greater protection against pollution.


The report also reveals that in most classrooms annual exposure to small particles was higher than recommended World Health Organisation guidelines, and that this was caused by a combination of indoor and outdoor sources. 


The impact of outdoor air pollution on indoor air quality underlines the importance of the hard-hitting measures such as introducing the 24-hour Ultra Low Emission Zone in Central London and cleaning up the bus fleet. 


The audits will also review a range of methods to reduce pollution outside nurseries, including restricting road access outside entrances at drop-off and collection times, moving playgrounds away from congested roads, installing green ‘pollution barrier’ hedges, tackling engine idling and promoting cycling and walking.  


The £250,000 programme is funded as part of the Mayor’s Air Quality Fund and audits will be conducted by global engineering consultancy WSP, which will spend the next few weeks in the nurseries, assessing indoor and outdoor air pollution sources, looking at how children travel to the nurseries, and reviewing local walking routes including traffic crossings. These will be the first City Hall trials of indoor filtration, beginning in spring 2019, and results are expected later in the year, alongside a toolkit that can be given to all non-participating nurseries so they can conduct their own audits. 


Built into the programme is a ring-fenced starter grant of £4,500 for the 20 nurseries to help kick-start recommendations on completion of the audits.