What are the restrictions on directly releasing gases into the atmosphere? Are there any regulations?

When dust-containing gases are discharged directly, the following conditions must be considered, such as the concentration of pollutants, the amount of emissions, the existence of economically effective treatment methods, and the possibility of using air purification techniques. (1) Pollutant concentration: When the concentration of pollutants generated in an industrial sound field is not high, direct discharge will not exceed the **emission standards, and in such cases discharge is permissible directly. If the total emissions of pollutants exceed the standards, even if the pollutant concentration is low, they cannot be discharged directly; treatment measures must be taken before discharge. (3) Atmospheric self-purification: Direct emission of industrial exhaust gases should make full use of the atmospheric self-purification mechanism, so that the pollutants released into the atmosphere gradually disappear, thereby achieving harmlessness or minimizing harm. In situations where pollutants are likely to be transferred elsewhere or where pollution may worsen, direct emission of flue gases should be avoided as much as possible.