So in riding to work on a daily basis, do the physiological benefits gained from cycling to work get outweighed by the harm that pollution does to the body? I.e. does it cause more harm that it prevents.
My concern is that when riding to work, I am breathing harder and riding with the daily traffic, so exposing myself potentially to higher levels of pollution than I would riding on a weekend day or away from heavy traffic. This has the potential for causing respiratory issues, especially in Arizona where dust particles can cause irritation. Does this concern negate the positive benefits such as increased respiratory capacity, reduced blood pressure, etc.?