The best measure of how successful a regeneration scheme has been depends on the focus of improvements. Economic regeneration can be best measured by comparing employment rates, the local economy's size, industrial productivity, before and after the scheme. Social improvements may involve increased life expectancy, literacy rates, decreased applicants for social housing, reductions in social tension or changes to lifestyle (smoking habits, obesity, type of food bought). Improvements to the living environment include reduced air pollution, abandoned land utilised or an increase in green, open spaces. The sustainability of a scheme may be measured in the volume of carbon dioxide emitted, proportion of greenfield:brownfield land used, number of jobs created, how long the scheme is expected to benefit locals.