What is the B-level qualification of paint industry in heavily polluted weather?

One of the VOCs treatment grades of industrial painting.

The B-level qualification of heavy pollution weather painting industry is one of the levels of VOCs control in industrial painting, that is, the enterprise meets the B-level standard, that is, the VOCs emission reduction measures in the industrial painting process of the enterprise meet the requirements of the B-level standard; Construction machinery is one of the key industries for VOCs control of industrial coatings, and water-based coatings have become the "official" choice. Most provinces and cities advocate the use of water-based coatings and other environmental protection coatings instead of solvent-based coatings in VOCs governance related documents.