The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
From King's College London:
The City Air app - the healthiest way around London.Are you a jogger, cyclist, driver or commuter? Do you know when pollution is high or low?The City Air app will alert you on days when pollution is forecast to be high and give you tailored advice on simple actions you can take to reduce your emissions and exposure to air pollution.Use the map to plan your journey and easily pick the lowest pollution route through the City - even in 3D!You are the key to cleaner air.This application was designed and developed by the City of London Corporation and King's College London.