I have yet to see one that doesn't have clear claims otherwise, so this doesn't seem too surprising.
Check your MSDS. Even the community-perceived-as-safe PLA is pretty clear about recommending "local exhaust ventilation", which is quite a step up from "opened a window".
Check your MSDS. Even the community-perceived-as-safe PLA is pretty clear about recommending "local exhaust ventilation", which is quite a step up from "opened a window".