Why is there no smog in Beijing?

The smog in Beijing doesn't always exist. Sometimes when the weather is fine or windy, there will be no smog. In recent years, Beijing has made great efforts to control smog. Many substandard small workshops, polluting small enterprises and chemical units in the surrounding areas have been rectified, closed and relocated, and some air pollution environments have been cleaned up. The effect is seen. There are fewer foggy days in Beijing. Main reason: 1. Meteorological conditions are conducive to the diffusion of particulate matter. 2. The transformation and production limitation of industrial enterprises in China is unprecedented, and the emissions are obviously reduced, especially in the surrounding provinces of Beijing. 3. The coal-fired boiler has been changed into a gas-fired boiler. The combustion products are only carbon dioxide and water, and the fuel is much cleaner. 4. The control of building dust and automobile exhaust is very strict, and the law enforcement is strong. 5. Automobile oil in Beijing and nearly 30 surrounding cities is the most stringent national standard gasoline. 6. Through several years of publicity and legislative governance, the concepts of environmental protection and ecological protection are deeply rooted in people's hearts, and people can start from themselves and care for the environment.