Every aspect of our environment can impact on our health, from air or water pollution to a healthy diet and a decent home. For example, in the UK up to 24,000 vulnerable people are estimated to die prematurely each year because of exposure to air pollution, much of which is due to road traffic. How we feel about our immediate environment can affect our quality of life and sense of wellbeing. Crime, the fear of crime, social exclusion and environmental decline in a neighbourhood are all associated with increased burdens on mental health.