How It Works

WHAT IS LIGHT POLLUTION?

THE BRIGHTEST CITIES ON EARTH

The global urban average is around 18.9 radiance units, which is a little brighter than West Yorkshire

Cities by radiance

Pollution comes in many forms, such as plastic waste, greenhouse gases and sewage. However, there’s one type of pollution that often gets overlooked, and it can have serious implications for our environment and even our health.

Light pollution, or photopollution, is the presence of excess artificial light and is a result of urbanisation and industrialisation. Street lighting, domestic and commercial lights, vehicles and security lights all contribute to the creation of a dome-like shield of light pollution called skyglow. Along with skyglow, light pollution consists of glare, light trespass and

You’re reading a preview, subscribe to read more.

More from How It Works

How It Works6 min read
Picturing the Planets
Over 3,000 years ago, Babylonian astronomers discovered that five bright points of light moved across the night sky in a different way from all the other stars. These were the planets we now call Mercury, Venus, Mars, Jupiter and Saturn. In those ear
How It Works1 min read
Fast Facts
NEIL ARMSTRONG’S BOOTS ARE STILL FLOATING IN SPACE This much urine contains enough minerals to charge your phone for three hours Global warming is affecting gravity in Antarctica The world’s oldest fossil forest was recently discovered near Minehead,
How It Works5 min read
How Astronauts Train For space
In space, astronauts lose an average of 1.0 to 1.5 per cent of mineral density in weight-bearing bones per month To build up their bodies, cope with confinement and monitor machinery, astronauts must embark on rigorous training programs For many, it’

Related Books & Audiobooks