Article is actually wrong and they do provide some advice on this.

https://multimedia.3m.com/mws/media/339742O/3m-full-facepiec...

> Also NIOSH-approved with 3MTM Canister CP3N for use against CS, CN and as a P100 filter (TC-14G-0251) in riot conditions, including those with teargas (non-CBRN).