Quote Originally Posted by early morning View Post
Here ya go, IL:
Granted, it's not a new study, but....

https://www.mja.com.au/journal/1998/...t-gas-suicides
nice answer!

91-1992.
Conclusion: Catalytic converters and the associated lower CO emission limits of 9.3 g/km had not, by 1995, resulted in a reduction in numbers, rates or percentages of exhaust gas suicides in Australia.