We just finished an independent survey of 5 consumer level machines with a bunch of different materials, looking at both 10-500nm particulate and HCN emissions. Essentially, even with ABS, if you're in a decently well ventilated area, you're fine, and if you're still worried, PLA or TPU drastically reduce particulate.

I'd really love to share the paper right now, but it's someone else's masters thesis that hasn't been released yet. If anyone is interested in it and can remember, ping me in a few months?