Free mass transit in Paris while smog persists
http://www.thelocal.fr/20161208/pari...-million-a-day
Also males comparison to India levels

Smog limits visibility to 50 m at the worst times in Delhi which continues to try to meet its 2001 target for eliminating diesel buses[1]. Air in new commercial buildings in Beijing is heavily filtered. Look up Asia-Pacific's Green Building Award winners. The Great Smog of London, 5 days in 1952, produced 4-12 thousand dead & 100,000 sick. Paris, Mexico City, Madrid and Athens to ban diesel vehicles by 2025 putting pressure on London to follow suit[2]. Diesel particulate filters on vehicles built to the 2009 'Euro 5' standard require high maintenance to work well[3]. Meanwhile, there are concerns about exhaust from burning natural gas[4]; next step fuel cells?

[1] http://scroll.in/article/807463/delh...work-this-time
[2] http://www.independent.co.uk/environ...-a7451611.html
[3] http://www.truckinginfo.com/article/...and-curse.aspx
[4] http://timesofindia.indiatimes.com/c...w/48398994.cms