Looking up at the night sky in the city, even if the sky is clear, the stars that can be seen are becoming less and less, mainly due to the light pollution caused by the bright lights of the city at night. However, scientists have recently discovered that light pollution will not only cause problems for astronomers, but may even make global air pollution more and more serious.

According to a study by the National Oceanic and Atmospheric Administration, a chemical called nitrate (generally referred to as an anion of nitrate) is restricted and hindered by street lights, which can break down harmful gases emitted by cars and factories.

Research tests conducted by Harald Stark, a scientist at the National Oceanic and Atmospheric Administration in the city of Los Angeles, showed that light from buildings, streetlights, and car lights inhibits nitrate. "Our preliminary findings prove that city lights can slow down cleaning at night by 7% and increase the starting chemicals that cause ozone pollution the next day by 5%." "Our next step is to quantify its impact more accurately, which is how much ozone our city actually produces the next day," Stark said. It's important to do this because many cities are already approaching the limits of ozone control levels, so even a very small response like this can have a huge impact. ”

Although the light is much dimmer than the sun, it can still have adverse effects that are difficult to ignore. Stark suggested a possible solution to change the color of the light to red, which is less intrusive, but that may not be practical. Stark had another, simpler remedy by changing the direction of the light to downward. Because the less upward facing light, the less effect on nitrate in the atmosphere. Li Zhongdong