Billution, a portmanteau of two words: bicycle+pollution

for more portmanteaus see podcast #51

http://lewissandler.podbean.com/e/portmanteaus-51/

http://www.cnbc.com/2017/04/17/ofo-chinese-bike-sharing-start-up-says-its-now-worth-more-than-2-billion.html

Kevin Frayer | Getty Images
A worker from the bike share company Ofo puts a damaged bike on a pile at a makeshift repair depot for the company where thousands of derelict bikes are being kept after coming off the road on March 29, 2017 in Beijing, China.