Discover Thomson Reuters
Nearly 100 sensors fixed around London since January have revealed the city's air pollution is dangerously high, according to a charity and the city mayor's office. Anna Bevan reports.
01:38
01:30
01:24
00:55
00:28
01:05
00:46
01:17
02:23
01:10
01:48
01:09
02:05
02:17
00:29
00:53
00:34
02:15
00:33