Air quality · 2026

Indoor air quality: a UK guide

Indoor air is often more polluted than the air outside, yet we spend around 90 per cent of our time in it. The good news is that home air quality is very fixable once you know the handful of things that actually drive it.

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The main indoor pollutants

Measure before you fix

The fix: ventilation + filtration

Ventilate to clear CO2 and moisture; filter to remove particles. A MERV-13 purifier handles the particle load (~93 per cent of airborne particles); add activated carbon for odours and VOCs. Together with sensible ventilation and humidity control, that covers the great majority of indoor air problems.

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Frequently asked questions

Is indoor air really worse than outdoor air?

Often, yes — homes concentrate cooking particles, VOCs from furnishings and cleaning products, and pollution that drifts in. Since we spend ~90% of our time indoors, it is worth addressing.

What is the single most effective step?

A combination: ventilate for CO2 and humidity, and run a well-sized MERV-13 purifier for particles. Add carbon if odours and VOCs are an issue.