Is the 20 17 high temperature subsidy payment standard mandatory?

Is Z0 17 mandatory to issue high-temperature subsidies? According to national regulations, when the outdoor temperature is above 35, outdoor workers should be given high temperature subsidies. For example, outdoor workers such as construction workers, sanitation workers, steel mills and coal miners. It is mandatory. The adjustment range of high-temperature subsidies this year is generally around 300 yuan ... This is the concern of the state for outdoor workers and the guarantee for the smooth completion of the project.