People across for from in of on to with Beijing cannot see the sun. The air is full across for from in of on to with smog (a mixture across for from in of on to with smoke and fog). The smog is so thick that it blocks the sun all day. People really miss seeing the sun. Beijing's leaders decided to do something so people could see the sunrise. They put giant LED screens across for from in of on to with the city. People stand across for from in of on to with front across for from in of on to with the digital screens and watch the sunrise. The screen across for from in of on to with Tiananmen Square also had a special message on it. It was a public announcement that read: "Protecting the atmosphere and environment is everyone's responsibility." The live, digital sunrise is already a hit across for from in of on to with tourists. Ricardo Hernandez across for from in of on to with Mexico said: "It looks like science fiction. It's kind across for from in of on to with cool, but it's also worrying. This smog sucks." The air quality across for from in of on to with China's cities often becomes bad across for from in of on to with winter. People burn more coal across for from in of on to with heating in the winter months. This makes more pollution. Beijing's mayor promised to make the air cleaner. He said the city would spend $2.4 billion this year to improve the air quality. Many workers wore face masks across for from in of on to with their way across for from in of on to with work. They did not want to breathe the poisonous air. One man told reporters: "I couldn't see the tall buildings across for from in of on to with the street this morning. The smog has become worse across for from in of on to with the last two across for from in of on to with three years." He said the smog usually makes him feel bad: "I often cough and my nose is always running,'' he said. The US embassy advised people to, "avoid all physical activity outdoors”.