Looking up at the night sky in the city, even if the sky is clear, there are fewer and fewer stars. This 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 problems for astronomers, it may even make global air pollution more and more serious.

    According to a study by the National Oceanic and Atmospheric Administration of the United States, a chemical substance called nitrate (generally referred to as the anion of nitrate) is restricted and hindered by street lights. This substance can decompose emissions from cars and factories. harmful gas.

    Research and testing conducted by Harald 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 the cleaning speed at night by 7% and increase the starting chemicals that cause ozone pollution by 5% the next day." Stark said, "We need the next step To quantify its impact more accurately, that is, how much ozone is actually produced in our city 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 if it is extremely small like this The reaction may also have a huge impact."

    Although the light is much dimmer than the sun, it still produces bad effects that are hard to ignore. To this end, Stark proposed a possible solution, that is, to change the color of the light to red, which has a lesser impact, but this may not be practical. Stark has another simpler remedy to change the direction of light to downward. Because the fewer lights facing upwards, the smaller the effect on nitrate in the atmosphere. Li Zhongdong