光害
Light pollution is the level of radiance (night lights) shining up into the night sky. The Campaign to Protect Rural England (CPRE) divides the level of night sky brightness into 9 bands with band 1 being the darkest i.e. with the lowest level of light pollution and band 9 the brightest and most polluted. Stanford has an index of 0.5-1 nanoWatts (nW) which places it in band 3. However, the night sky brightens towards Langford, Clifton and Shefford.