Research recently published by experts in Canada shows that portable air filters (PAFs) such as those that could be used to clean the air in school classrooms and other indoor spaces are an important tool to help reduce the risk of transmission of airborne infectious diseases.

This is a simple guide to a complex topic to help you avoid bear traps when buying an air cleaning device using filters. 

We have a much more advanced guide available for those wanting to understand more about the reasoning behind the principles, considerations and checklist we have created. 

Sky News has reported that supply teacher costs are rocketing because of chronic teacher shortages and increased sickness absences; and that it has cost the education system nearly £1.4 billion in the last year alone. That money could be better spent on pupil enrichment.

Look at this image of two air cleaners, one used in a school, and the other brand new. The dirty one has collected all the muck that otherwise would have been breathed in by a child in a classroom. It started off white. It’s scary, isn’t it? That could all be in your child’s lungs. (And in your own lungs, too, because we all breathe similar air every day.)

If you agree that Bristol kids should breathe clean air when they are in school, we’d be delighted if you would help us.

Sian Berry, a Green MP for Brighton, has today introduced legislation into Parliament to establish the right to breathe clean air, and to have minimum standards in relation to the quality of the air we breathe.

Ruth Brooker, the founder of Clean Air for Kids, took her campaign to the streets of Bristol, and got a lot of interest from local residents.

This week, our poster on indoor air pollution is being promoted by Teach Primary magazine!

In January 2022, Bridget Phillipson, as Opposition Education Secretary, posted an epic thread on X (Twitter).

The economic benefits of improving New Zealand’s indoor air quality have just been demonstrated in a report to the Facilities Management Association of New Zealand.

It’s two years since Whole Family Productions created this video to inspire other children to have a go at building an air filter for their classroom.

For the last three years, I’ve been building and maintaining DIY air filters for our primary school.

A study published in February 2025 by the Grantham Research Institute on Climate Change and the Environment at the LSE and Columbia University.

Recently, I was really proud to be part of a meeting with the Green Party’s Baroness Natalie Bennett, who is a member of the House of Lords.

As luck would have it, this really significant Indoor Air Quality event was happening in Bristol. So I made sure I got the chance to attend

During the election, my kids and I hit the campaign trail to find Carla Denyer (our Green MP to be) and give her an air filter - “Greta the Germ Gobbler” that we built for her office.