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Looking up at the night sky in the city, even if the sky is clear, there are fewer and fewer stars to see, mainly due to the light pollution caused by the bright lights of the city at night. However, scientists have recently discovered that light pollution can 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 an anion of nitrate) is limited and hindered by road lights that can be decomposed by cars and factories. harmful gas.

    Research 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 results show that the city's lighting can slow down the nighttime cleaning rate by 7% and increase the initial chemical that causes ozone pollution the next day by 5%.” Stark said, “We need the next step.” A more accurate quantification of its impact, how much ozone is actually produced in our city the next day. It is important to do this because many cities are close to the limits of ozone control, so even if it is so small The response may also have a huge impact."

    Although the light is much darker than the sun, it still has an adverse effect that is hard to ignore. To this end, Stark proposed a possible solution, which is to change the color of the light to a less influential red, but this may not be practical. Stark has another, simpler remedy to change the direction of the light down. Because the less light is on, the effect on nitrate in the atmosphere is smaller. Li Zhongdong