Maximum Permissible Exposure Level
permissible exposure limit
Permissible exposure limits
A weighted sound exposure level
Cumulative exposure level
cumulative exposure level of total 16 polycyclic aromatic hydrocarbons
occupational exposure level
Occupational hazard exposure level
coupling mechanism between upper level and low level jet
fiscal system at county level and township level
interaction between upper level and lower level
municipal level and county level
coal mine permissible explosives
coal-mining permissible explosive
limit and permissible load
maximum permissible concentration