Is it necessary to write in the notice that the noise of occupational hazard factors is qualified?

From the point of view of occupational health, according to GBZ/T229.4-20 12 "Classification of Occupational Hazards in Workplaces-Part 4: Noise Requirements", the operation with sound harmful to hearing, health or other hazards and the equivalent sound level of noise exposure A is 8h/d or 40h/ week is called noise operation. In the process of occupational disease identification, only workers engaged in noise operations can be diagnosed as occupational noise deafness. According to occupational exposure limits of Hazardous Factors in the Workplace (GBZ2.2-2007), Part 2: Physical factors, the limit of steady-state noise is 85dB(A), and the limit of equivalent sound level of unsteady-state noise is 85dB (a); The working day per week is not 5d, so the equivalent sound level of 40h needs to be calculated, and the limit value is 85dB(A). Basically, when the 8-hour equivalent continuous A sound level in the working environment of an enterprise is greater than 80dB, employees need to undergo noise-related occupational health examination, and when it is greater than 85, they need to be equipped with personal protective equipment such as earplugs.