Air quality, explained.

Understand the pollution, check the evidence and find a practical next step. Start with the question that brought you here.

PM2.5: what it means and how to use the reading ↗

A practical explanation of fine particle pollution, concentration readings and the decisions they can support.

How PM10 differs from PM2.5 and why the two readings should not be treated as duplicates.

Understand the difference between an air-quality index, pollutant concentration and the local method behind a colour.

What established health evidence means for interpreting local air-quality information.

Small, evidence-aware planning choices for days when official air-quality information is less favourable.

Use current local information and forecasts to adapt an outdoor run to changing conditions.

A calm, practical framework for checking local air information before time outdoors with children.

The 48-hour forecast in the Atmiq app: hourly chart, uncertainty, best windows for a chosen situation and what the colours mean.

A step-by-step way to compare apparently conflicting readings without assuming that one service must be wrong.

Choose a service by the questions it can answer and the transparency of its data, rather than by a colour alone.

A short guide to WHO’s findings on ambient, or outdoor, air pollution.