Looking up at the night sky in the city, even if the sky is clear, there are fewer and fewer stars that can be seen, which is mainly caused by 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 astronomers trouble, 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 referring to the anion of nitrate) is restricted and hindered by street lights. The substance can decompose harmful gas.

    Research conducted by Haral Stark, a scientist at the National Oceanic and Atmospheric Administration in Los Angeles, showed that light from buildings, street lights, and car lights can inhibit nitrate. "Our preliminary research results prove that city lights can slow down the cleaning rate by 7% at night and increase the starting chemicals that cause ozone pollution the next day by 5%." Stark said, "We need To more accurately quantify its impact, that is, how much ozone is actually produced in our cities the next day. It is important to carry out this work because many cities are already close to the limit of ozone control levels, so even this is very small May also have a huge impact. "

    Although the light is much dimmer than the sun, it still has undesirable adverse effects. For this reason, Stark proposed a possible solution, which is to change the color of the light to red with less influence, but this may not be practical. Stark has another simpler remedy to change the direction of the light down. Because the less upward the light, the smaller the impact on the nitrate in the atmosphere. Li Zhongdong