I commute 20 miles a day in Los Angeles area. The air here is pretty horrible.

What mostly bothers me is DUST! It rains very rarely here and dust accumulates on all surfaces. There are also these nasty dust blowers that like to blow on the curb right where I bike.

Anyway, today I tried to use this exact type of respirator and unfortunately several problems got revealed:

- the warm air that comes out of it from the top, foggs the sunglasses. :d (it was early in the morning, so I will see if it happens during the day, but it was a big inconvenience that forced me to take the glasses off);

- it DOES restrict breathing. When going fast or uphill, breathing deep through the mouth, I felt restriction.

- it feels bad! This mask is not going to stay fresh or dry for long! Sweat and moist make it pretty nasty to wear! You also smell it all the time since it covers the nose.

So, unfortunately this mask is not a real solution to pollution problem while commuting. At least for me.

http://www.goldenspirit.com/Labyrint...dustpatrol.jpg

http://www.safmed.com/store/product58.html