Our methodology
We'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.
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.
