Offgassing from tyres is a myth now.

I have seen many comments about this subject used to shut down discussion about the use of tyres.
This report is interesting and even suggests that in some cases tyres may be used to absorb gasses.
https://pangeabuilders.com/tire-offgassing/

I will follow up when I get more time.
From that link;
From: New Mexico Environmental Department – Solid Waste Bureau
re: University of Wisconsin Study
“Rather than trying to pull out specific parts of the study that could be used to let people know that scrap tires are not a problem with respect to out-gassing,
I decided to have a copy made of the whole report and send it to you. You can use whatever information in the report you choose.
The title of the report is “Use of Scrap Tires in Civil and Environmental Construction” May 10, 1995. Environmental Geo-technics Report No. 95-2. Geo-technical Engineering Program Department of Civil & Environmental Engineering.
Actual Report 'use-of-scrap-tires-in-civil-and-environmental-construction#'


Here is another https://www.researchgate.net/publication/337339360_The_Use_of_Scrap_Tires_in_the_Construction_Sector