Written by Josh Jackman Updated on 7 June 2022 ✔ Sir John Cass's Foundation Primary School is London’s most polluted school✔ 5 of the top 10 most polluted schools are in the City of London✔ The least polluted school is Canary Wharf College, in Tower HamletsAir pollution is a scourge on the environment and humanity – and a crucial part of choosing your child’s school.Toxic emissions can lead to everything from asthma to pneumonia and lung cancer, and can even prove fatal. The pollution in London causes 9,500 premature deaths per year, according to a study from King’s College London. Did You Know? Air pollution reduces the average Londoner’s life by about a year, according to The London Air Quality Network.And as well as physical impairments, pollution can also have a negative effect on children’s intelligence, according to a National Academy of Sciences study – setting your kids’ development back by as much as a whole year.Our methodologyWe’ve combined air pollution research from the Greater London Authority (GLA) – which shows the amount of pollution in each borough – with the GLA’s London Atmospheric Emissions Inventory’s (LAEI) data on nitrogen dioxide (NO2) emissions in every London school.This means our results take into account the NO2 levels of every school in the capital, along with the emissions of particulate matter that’s 10 micrometers or less (PM10), particulate matter that’s 2.5 micrometers or less (PM2.5), and carbon dioxide (CO2) in their borough.All of these harmful gases are measured on a different scale, so we’ve calculated the London average for each of them. We then worked out what each borough should score if it’s to meet that average, based on its population and area.The areas which fail to meet this target by the largest margins are the City of London and Hillingdon – and those are the ones which contain the most polluted schools in London. Tower Hamlets is the best-performing London borough for air pollution, and therefore boasts all of the top 10 schools with the least air pollution.So, let’s find out the identity of those best and worst schools when it comes to dangerous emissions.What’s on this page? 01 Most polluted schools 02 London’s least polluted schools 03 How many kids does this affect? 04 How it affects child development 05 What is the School Air Quality Audit Programme? 06 How to improve air quality around schools 07 Next steps London’s most polluted schoolsNo.SchoolBoroughAgesStudents% below the averageGrade1Sir John Cass's Foundation Primary SchoolCity of London4-11210-678.99U2City of London School (Boys)City of London10-18937-678.77U3St Paul's Cathedral SchoolCity of London4-13254-671.60U4Charterhouse Square SchoolCity of London3-11200-660.97U5City of London School for GirlsCity of London7-18707-647.41F6Cherry Lane Primary SchoolHillingdon3-11686-134.95D+7Lady Nafisa Independent Secondary School for GirlsHillingdon11-1655-131.13D+8Uxbridge High SchoolHillingdon11-181,230-130.94D+9The Global AcademyHillingdon14-19297-130.72D+10William Byrd Primary AcademyHillingdon3-11608-129.13D+(All are mixed-gender institutions unless mentioned otherwise) London’s least polluted schoolsNo.SchoolBoroughAgesStudents% above the averageGrade1Canary WharfCollege (East Ferry)Tower Hamlets4-11277149.83A+2Canary WharfCollege 3Tower Hamlets11-19160148.65A+3River HouseMontessoriTower Hamlets3-16308147.49A+4South QuayCollegeTower Hamlets14-1943146.73A+5George Green'sTower Hamlets11-191,165145.88A6Cubitt TownInfants & JuniorsTower Hamlets3-11704145.45A7Canary WharfCollege, GlenworthTower Hamlets4-11219145.33A8St Luke's C of E PrimaryTower Hamlets3-11413145.33A9Harbinger PrimaryTower Hamlets3-11327144.61A10Seven MillsPrimaryTower Hamlets3-11230144.43A(All are mixed-gender institutions unless mentioned otherwise. The Cubitt Town schools have been combined because they share the same site and score)This is where you can find the most and least polluted schools How many children does this affect?There are 1,452,286 children attending 3,157 schools in London, according to Department for Education data from 2019.Every single one of them is negatively affected by air pollution.While some areas of London are better than others – going to school in Tower Hamlets or Hackney is definitely preferable to the City or Hillingdon – every part of the capital has a negative impact on kids.The World Health Organisation’s (WHO) guidelines state that PM2.5 shouldn't exceed an annual average of 10 micrograms per cubic metre (μg/m³) – and every single London borough breaks that directive.London also falls short when it comes to harmful NO2 emissions.The UK’s annual target is 40µg/m³, and according to the LAEI, 22 out of the 33 London boroughs contain primary schools which fail to stay below this level.In total, 485 schools are immersed in pollution which exposes kids to an unhealthy level of NO2 – that’s 15.4% of London’s 3,157 institutions.This makes your choice of school even more important, as the wrong decision can end up impairing your young ones’ abilities. How can air pollution affect a child’s development?High levels of air pollution can impede intelligence, according to a National Academy of Sciences study from 2018. “Polluted air can cause everyone to reduce their level of education by one year, which is huge.”– Yale University’s Dr Xi Chen, to The GuardianThe Chinese professors found air pollution does more damage, the more often people are exposed to it. This sounds obvious, but emphasises how vital it is to choose a school in an area with lower emissions rates – even in a polluted city like London.Their study showed that pollution impacts people's verbal ability, and typically affects men more than women.Even small increases in air pollution have also been linked to an increase in mental illnesses in children.A 2016 study in The BMJ measured NO2, PM10, and PM2.5 emissions in four Swedish counties, and found higher levels were linked to more mental health problems for the counties’ 552,221 kids.The children in places with increased pollution were more likely to require treatment for psychiatric disorders, receiving everything from sedative to antipsychotic medications.Increased air pollution can also put children at risk of several troubling physical ailments.Kids are naturally smaller individuals, and therefore take in proportionally more tainted air than adults.This is exacerbated by the fact that youngsters are usually closer to the level of vehicle exhausts. They’re also typically more active, which results in them breathing in more emissions, according to the WHO.Because of this, the British Lung Foundation has warned that pollution can result in children suffering from:Decreased lung functionAsthma (or a more severe version of asthma, if it’s already present)Lung cancerInfections like pneumonia What is the School Air Quality Audit Programme?This is an initiative led by London Mayor Sadiq Khan to analyse and improve the air quality levels at 50 primary schools in the most polluted areas of the capital.The programme was launched in 2017, after Khan described air pollution as “the biggest public health emergency of a generation.”Khan explained in a report that the £250,000 audit was undertaken “with the aim of reducing emissions, as well as reducing primary school children’s exposure to polluted air.”The scheme, which is funded by the £22 million Mayor’s Air Quality Fund, has made £800,000 available for the affected schools to implement the report’s recommendations.Since the end of the primary school audit, Khan has created a similar programme for nurseries.The £250,000 scheme will audit 20 nurseries in London’s most polluted areas, before giving each of the institutions £4,500 to enact its recommendations. How to improve air quality around schoolsLooking to help your students or children breathe better around their school? Focus on car emissions.Limit the number of cars around the school and the time they spend in the area, and encourage anyone picking up kids to drive greener vehicles or use more eco-friendly modes of transport.The main suggestions which the Mayor’s Air Quality Audit Programme made to schools were:Make sure school entrances and playgrounds aren’t near busy roadsIntroduce better road layouts around the schoolBar the highest-polluting vehicles from the surrounding areaCreate pedestrian areas by the entrancesStart a “no engine idling” initiative to reduce emissions from parents’/guardians’ carsPromote low-emission vehicle usageReduce emissions from boilers, kitchens etc.Plant bushes along busy roads and in playgrounds to help filter fumesEncourage students to walk and cycle to school along cleaner routes Next stepsThe best course of action you can take for your child is to send them to school in a less polluted area – any of the top 10 schools in our list would be ideal.Once you’ve done that, we’d urge you to encourage – whether gently or forcefully – that school to enact green policies like the ones above.This will ensure that your children – and all the other students – have the best chance possible of avoiding the worst effects of air pollution. Written by: Josh Jackman Lead Writer Josh has written about eco-friendly home improvements and climate change for the past four years. His work has been displayed on the front page of the Financial Times, he's been interviewed by BBC One's Rip-Off Britain, and he regularly features in The Telegraph and on BBC Radio.