airAlert

The airAlert app allows users to see forecast air pollution and cold levels in chosen areas on the south of England.
The app also currently can show coldAlert levels as well.
The service, provided by the Sussex Air Quality Partnership (Sussex-air), sends free messages direct to vulnerable people informing them about air pollution or cold levels in their area.
airAlert is targeted at people with respiratory health problems who may be affected by air pollution or cold.
airAlert warns people the day before or on the day that elevated air pollution is expected to occur.
airAlert sends a voice,text message or notification direct to you (via your mobile or home telephone, email or by notification to the airAlert app or via webpages or RSS on your PC)
Current the service covers 4 areas in the south of England (Sussex, Surrey, Sevenoaks and Southampton).