Parts of the UK reached the highest level of air pollution on Friday, prompting health warnings.
Warm, still conditions combined with traffic fumes, pollution from the continent and dust from the Sahara.
Experts warned vulnerable people not to take strenuous exercise outside.
Click the map to find out about current air quality levels where you live. 
Pollution Masks - The 'Original' and still the best - Established 1993 - Made in the UK 
Respro® Masks are reusable
Respro® Bulletin Board 