This a thousand times. I wear a p3 mask to cycle to work, because I work in central london and don't want to fill my lungs up with crap(as fast). a P3 mask fi

This a thousand times. I wear a p3 mask to cycle to work, because I work in central london and don't want to fill my lungs up with crap(as fast). a P3 mask filters 99% of >0.3 micron particles. It stops diesel fumes, but not smell. I've not tried it with wood smoke, but I suspect that'll fill up the filters much quicker. you can 100% smell sewers still. I have recently got some filters that claim to get rid of "troublesome" smells as well, by bundling a carbon filter on the inside. I was forced to by these as everyone had panic bought normal filters. When I replace my filters next week, I'll see if it makes a difference.