Unhealthy air alert for major cities in China – Beijing/Shanghai Air Quality (Data from US Embassy) Review

Useful alert that gives air quality information to help 'sensitive' people plan their exercise. Air quality is a major issue in the 5 cities covered and this app helps to plan exercise--and give an excuse to curtail strenuous work and/or exercise.
Review by Hal220 on Beijing/Shanghai Air Quality (Data from US Embassy).