I live in LA and love riding around midday when it's bright and sunny. Unfortunately, that is when the smog is at its worst and I can't breathe after a couple of hours. My lungs hurt like there's needles sticking in them. Has anyone ever worn a gas-mask when going cycling? Could you recommend one? The smog here in LA won't be managable until about October which is 3 friggin months from now. Thanks.