It's not just Beijing and New Delhi: New York Times: https://nyti.ms/2lsAZ2S ^ London smog in January. Matt Dunham/Associated Press It would appear that London needs more electric cars and fewer diesel ones. As a bicycle commuter since 1978 I have a particular hatred of diesels. Around here trucks are among the most common vehicles and a large majority of them are diesels. Not much fun slowly pedaling up a 14% grade when being passed by diesels — I can't just not breathe for awhile!