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.
[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.