[contingencies]

London is really not that polluted. It rains too much to be very polluted. AQI is currently 88 in the worst areas. In China many cities are often 150-200 range. India is off the charts, my friend who makes commercial air quality sensor arrays said most sensor tech maxes out way below ambient Indian levels and readings cannot therefore be trusted - nobody knows how bad it is.

http://aqicn.org/map/london/ http://aqicn.org/map/jiyuan http://aqicn.org/map/delhi