1, the concentration of fume emissions shall not exceed 2.0mg/m3, and the purification efficiency of the corresponding purification system shall not be less than 85% of the large-scale system;

2, medium-sized system shall not be less than 75%;

3, small system shall not be less than 60%.

The hazards of restaurant fume exhaust are as follows:

1, skin damage. There is more than oil in the fumes, there is soot. Oil is easy to adsorb to the face, and then adsorb the soot, in the long run it clogs the skin, affecting the normal breathing of the skin, thus making the skin lose elasticity. Not only are pores large skin yellowish, but also feel very greasy face every day;

2, the damage to the lungs. Smoke damage to the lungs is no less harmful than smoking on the human body, long-term breathing in a high concentration of fumes, will cause irreversible damage to the human lungs;

3, the damage to the eyes. Oil smoke on the eyes will also have damage, in the frying of oil smoke will stimulate the eyes, especially some people with dry eyes in the frying, the eyes will therefore become more dry, more than tears;

4, the damage to the voice. Oil smoke will irritate the human voice, especially people with pharyngitis, when the oil smoke is breathed into the throat, it will cause the throat to become more dry, itchy and painful, like having a bad cold.

Legal basis:

"Eco-environmental Standards Management Measures" Article 21

Pollutant emission standards include air pollutant emission standards, water pollutant emission standards, solid waste pollution control standards, ambient noise emission control standards, and standards for the prevention and control of radioactive pollution.

Water and air pollutant emission standards, according to the object of application is divided into industry-type, comprehensive, general, watershed (sea) or regional pollutant emission standards.

Industry-based pollutant emission standards for specific industries or product pollution control; integrated pollutant emission standards for industry-based pollutant emission standards outside the scope of application of other industry sources of pollution control; general pollutant emission standards for cross-industry common production processes, equipment, operations or specific pollutants, specific emission control; Basin (sea) or regional type pollutant emission standards apply to a specific basin (sea) or regional scope of pollution sources emission control.