Does air pollution have a effect on increased levels of asthma?

Where should I live if I want to reduce my exposure to air pollution?

Does sitting in a parked running car give bad air quality or cause bad health?

What are the risks of air pollution to cyclists? Would travelling outside of rush hour or along less congested roads significantly lessen any of the risks?

What is the link between pollen, air quality and health, and what are the costs to the NHS of treating the symptoms?