Taxi app Gett and air quality experts Evergen fund successful trial of innovative air purification units to clean air in Victoria primary school


A London primary school is enjoying an improvement in air quality levels following the installation of air purification systems that have been tested against some of the highest pollution levels anywhere in the world.


A partnership between taxi app and leading corporate ground travel provider Gett and award winning environmental company Evergen Systems has seen three of Evergen’s state of the art PureAire Monolite units installed in the main hall of St Peter’s Eaton Square Primary School in Victoria.


The trial project has been co-funded by both Evergen and Gett, as well as the taxi app’s customers who choose to donate an extra 20p for every ride taken.


With all of central London experiencing high particle pollution readings, the trial has explored whether the air cleaners could provide better air quality for children during the school day. Following installation at St Peter’s, particle pollution readings in the school have dropped with Nitrogen Dioxide levels – which particularly cause inflammation of the airways – and Ozone falling well within safe levels, as defined by the World Health Organisation.


John De Pree, Gett’s Marketing Director said: “The quality of the air our children breathe is of significant concern at this vulnerable stage of their lives and that’s why we’re investing in schemes that actively clean the air today. We’re delighted that this trial has produced such fantastic results.


“I’d like to thank all our customers who choose to donate 20p when hailing a Black Cab via our app, which helps fund these important initiatives. Now that we have proof that these innovative units can make such a difference to air quality, everyone at Gett is looking forward to rolling this out to other schools and making a difference to more kids as they study and play.”


Sukhbir Sidhu, Evergen’s Founder and Director said: “Like all major cities around the world, the UK faces significant air quality challenges, most of all in London. That’s why we tested our technology in one of the world’s most polluted cities – Delhi – where our solution was certified by the National Physical laboratory for its efficiency at cleaning outdoor air pollutants and bacteria.


“As a UK based tech company I’m thrilled that we’re making a difference to St Peter’s and looking forward to rolling this out to their whole building and to other schools. The uniqueness of Evergen is that not only can we clean indoor air, we can clean outdoor air as well – and hopefully with further support from Gett and other funding partners, we can start installing into playgrounds too.”


Miles Ridley, St Peter’s Head teacher said: “This problem is not unique to St Peter’s – all schools in London are being affected by rising pollution levels. This technology could not have come soon enough, and I’m delighted to see it making such a measurable difference to the air quality in the school.


“Our hall is used almost every minute of every day from different year groups, so every pupil gets to benefit from this improvement. Everyone at St Peter’s is grateful to Gett and Evergen for this partnership that is funding this important technology.”



Notes to Editors


About Gett’s environmental initiatives


Last year, Gett became completely carbon neutral, offsetting any carbon produced in carbon reduction programmes. Gett also offers access to the new TXE zero emissions capable taxi in London. With customers opting to donate 20p on top of the fare when hailing any Black Cab via Gett’s app, Gett is also now ‘environment positive’, actively improving air quality in London; funds enable the trial of air purification technology at St Peter’s, and into more classrooms and schools across the capital.


Evergen has worked with scientists from leading universities to develop the technology which was then tested in both indoor and outdoor spaces. The technology that successfully improved air quality levels in India is now being used in London for the first time, thanks to the partnership between Gett and Evergen.


About PureAire


PureAire filtration units use active ionisation to remove pollutants from air, coupled with advanced airflow engineering for outdoor applications. PureAire systems are patented, and tested and certified by a number of organisations in EU and India as highly efficient at removing airborne pollutants and bacteria. As well as being installed indoors, they are designed to be integrated into a variety of new and existing street furniture and city infrastructure – like bus shelters for instance – creating ‘microenvironments’ of clean air.


PureAire technology is far superior to the traditional paper filters such as HEPA (high efficiency particle absorption) which are found in traditional home and commercial air cleaners. Air purifiers based on PureAire technology are extremely low power consumption and as there are no filters to replace, are almost zero maintenance. Furthermore, there is no degradation of performance as there is no filter that can get blocked and impede airflow. PureAire is also environmentally friendly as there is no filter to be recycled.




What are the harmful pollutants and how are they measured?


Particle pollution is measured in micrograms per cubic metre (µg/m³). There are three measurable standards of PMs: PM1, PM2.5 and PM10. These denote the size of the particles and is measured in microns. The WHO safe limit is 10 µg/m³ for PM2.5.


What are the main pollutants?


Nitrogen Dioxide (NO₂) – is a toxic gas which causes inflammation of the airways. NO₂ is the main source of nitrate aerosols, which form an important fraction of PM2.5 and, in the presence of UV light, of ozone. The major sources of anthropogenic emissions of NO2 are combustion processes (heating, power generation, and engines in vehicles and ships).


Ground level Ozone (O₃) – not to be confused with the ozone layer in the upper atmosphere – this is one of the major constituents of photochemical smog. It is formed by the reaction with sunlight (photochemical reaction) of pollutants such as nitrogen oxides (NOx) from vehicle and industry emissions and volatile organic compounds (VOCs) emitted by vehicles, solvents and industry.


These pollutants are measured in µg/m³ or parts per million (ppm) or parts per billion (ppb). WHO safe level is 40 for NO₂, 20 for SO₂ and 100 for O₃ (in µg/m³).


What change has been seen at St Peter’s?


A precision air quality monitor was installed in the hall at St Peter’s, either side of the installation of the air purification units, between 18th and 23rd April and has provided the following data:


Pollution type    Pre-installation (µg/m³) peak     Post-installation (µg/m³) peak   WHO safe limit (µg/m³)

NO₂,                      47.1                                                        32.1                                                        40

PM2.5                   98                                                           11                                                           10



Monitoring still continues at the school and is being carried out by EarthSense, an independent air quality research and modelling company.



For head teachers interested in clean air at their school


Head teachers of schools who are keen to provide clean air for pupils should visit  to register their interest.


For companies and individuals looking to donate to a school


Companies and individuals wanting to give more children access to clean air can find out about making a donation directly to a school by visiting




About Evergen:


Evergen Clean Air is a division of Evergen Systems Ltd – an environmental innovation company based in Maidenhead, Berkshire. The company invests significantly in the development and installation of solar energy technology and air purification systems.


For further information:


Please visit Evergen’s “Media Q&A” page at

Alternatively, please contact Helen Bailey, marketing manager via