Bushwalk Australia

From ABC

http://www.abc.net.au/news/2017-01-31/m ... es/8227270

The Queensland Government is concerned the air is not fresh enough in national parks, citing air quality and passive smoking as key reasons for a partial smoking ban that comes into force tomorrow.

I think these moves are about making people more conscious of littering which is great and maybe of bushfire risk. With a bit of public health PR for the particular state.
Vehicle exhaust is much more harmful. Think starting the car in the garage and sitting in traffic. A better initiative could be solar busses and everyone has to walk or wheelchair in!