According to a 2018 report by the Center for Biological Diversity and compiled by the Guinness Book of Records for 2022, the city of Saint Petersburg, in Russia, is 8.1 times brighter at night than the urban average of the whole world .
As we mentioned at the beginning, the nighttime glow of modern cities, caused by street lamps, industrial lights and other forms of artificial lighting, is causing a decline in health for both people and animals ; many of them lose their sense of direction at night.
Light pollution is so widespread throughout the planet that there are many environmental groups that are calling for zones to be established where the law de facto prohibits artificial light.
On the other side of St. Petersburg, the largest dark-sky corner of the world is Wood Buffalo National Park , located in Alberta, Canada. This reserve of dark skies covers an area of up to 44,807 square kilometers.
