How do we protect our children from indoor air pollution?

Children are thought to be particularly susceptible to air pollution. They have higher oxygen demands then adults and their airways are smaller so they are more likely to get inflammation due to air pollution.

With COVID, schools are being asked to balance natural ventilation with reasonable temperature as fresh air can dilute indoor air and help prevent the spread of coronavirus. But what about also balancing the affect of outdoor air pollution where the school is located in a neighbourhood with poor air quality?

If there is a built in HVAC/mechanical ventilation system in the school that uses fresh air, check the filters and replace if necessary. If your HVAC system needs expensive upgrades, then consider installing portable air purifiers.

How should I choose an air purifier for a classroom?

Always ensure you choose an air purifier with HEPA filters. HEPA filter air purifiers are highly effective at filtering out particles the same size as the coronavirus.

Choose the best purifier for your class size. Schools should be aiming for at least 5 air changes per hour. All air purifiers should come with CADR ratings. Once you know the size of your classroom, our handy calculator will show you how much CADR you will need to achieve this level of air changes. If you have any trouble using our calculator, just drop us a line at

Check the noise levels. It is likely that you will run the air purifier on the lowest setting so it doesn't disturb class. When using the calculator, please bear in mind that most companies will only provide the CADR on the highest setting so do get in touch with them to check the CADR on low. We provide the CADR for all three settings allowing you to work out exactly how effective our purifiers will be at clean your class on the quietest setting.

Useful to know...

  • A gas leak in the US led to the energy company providing portable air purifiers to all schools within a 5 miles. The results in educational achievement was astounding and is probably one of a handful of real life research on the effects of clean air: Air filters create huge educational gains - Vox

  • All our purifiers will provide at least 3 air changes per hour which means that it takes just 20 mins to clean the air. Run the purifier on high for 20 mins and then turn down to the lowest setting

  • An air purifier shouldn't replace fresh air for your COVID strategy but is the next best thing if you can't open the windows or your heating and ventilation (HVAC) system doesn't bring in filtered fresh air. It can be used to supplement your current ventilation strategy and will still be effective at cleaning the air even with the windows open. However in terms of your indoor air quality (IAQ) strategy and the impact of poor air on our health and ability to concentrate, a good air purifier will yield excellent results

  • Get used to monitoring the indoor air and don't rely on purifiers with built-in air quality monitors. Accurate sensors are expensive and the results of in-built monitors could lull you into a false sense of security