The reason I asked this question in the first place?
When riding a bicycle alongside traffic, is this dangerous to inhale?
What about people who live on the ground floor next to a busy street?
Is breathing safe when there is plenty of ventilation?
The reason I asked this question in the first place?
When riding a bicycle alongside traffic, is this dangerous to inhale?
What about people who live on the ground floor next to a busy street?
Is breathing safe when there is plenty of ventilation?