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mdcc_tester can explain
[citation needed] 🤷‍♂️
A properly designed and fitted powered respirator can probably provide worthwhile protection against particulates with enough flow to make cycling possible.
The GAC filters probably trap a fair amount of un- or partially-burnt hydrocarbons as long as you replace them at appropriate intervals. I haven't seen anything which claims to protect against NOx and I'd be sceptical of any such claim short of a supplied-air respirator with an SCR plant in the loop.
gbj_tester
foreignfruit
Don’t bother
Waste of time @mdcc_tester can explain how if they actually were effective you wouldn’t be able to exercise in them.