With the continuous acceleration of urbanisation, artificial lighting has become an indispensable part of modern urban life. However, excessive or unreasonable use of lighting has caused a widespread but often overlooked environmental problem - light pollution. Light pollution mainly includes sky glow, glare, invasive light and over-lighting. These problems not only affect people's daily lives and health, such as interfering with the body's biological clock and sleep quality but also profoundly impact the ecological environment. Urban light pollution at night has also caused the once-shining starlight to no longer exist. Originally, the night was not pitch black but was dotted with stars and the moon. The natural night sky has gradually become a luxury for city dwellers.

In this project, I record the urban light pollution in London through infrared photography. I photographed an area close to the Greenwich Observatory because it was once an important historical landmark and astronomical institution in the UK. However, with the Industrial Revolution and the development of the city of London, the observation conditions in the Greenwich area gradually deteriorated in the early 20th century. The light and air pollution caused by urban expansion, especially coal smoke and bright lights, seriously hindered astronomers' research on faint celestial bodies in the night sky. Overlooking the Greenwich Observatory, I took a series of photographs in chronological order from sunset to complete darkness to show the scene of light pollution gradually occupying the city’s night sky. One set of images records the light pollution by an infrared camera, and the other set records light pollution by a regular digital camera.