School Filters Programme: Cleaner Air for London’s Children

The Mayor of London launched the School Filters Programme in September 2025 with £2.7 million funding to improve air quality in classrooms across more than 200 schools. The initiative aims to protect children’s health by reducing exposure to harmful pollutants, particularly PM2.5, which can stunt lung growth and worsen respiratory conditions. Research shows children in polluted areas develop smaller lung capacity. Other trials found HEPA filters reduce PM2.5 by 27–68%, and schools report they are practical and well-received.

Schools invited to participate in the scheme are selected based on air quality and deprivation levels and will be contacted by the GLA or their delivery partner Walk Wheel Cycle Trust (formerly Sustrans) directly. There is no application process for schools to receive the filters, but more schools may be invited at a later date.

What the Programme Delivers

• HEPA air filters in classrooms to cut PM2.5 levels.

• Air quality education through assemblies and classroom activities.

• Maintenance and support, including filter replacements.

• Indoor air quality monitors and evaluation to measure impact.

Background

• Between 2017–2020, audits of 50 schools and 20 nurseries recommended measures like:

  • Moving play areas away from busy roads.

  • Anti-idling campaigns.

  • Green barriers and improved road layouts.

• Funding has supported greening projects and school streets through the Mayor’s Air Quality Fund.

Looking Ahead

The programme complements wider efforts to tackle pollution, including School Superzones, Breathe London sensors, and projects supporting vulnerable pupils with asthma action plans.

For full details and resources, visit London City Hall’s School Filters Programme page.