Any safety manager will reasonably segregate personal protective equipment (PPE) into categories based on the hazards such equipment is designed to mitigate.
Hydraulic fracturing has been used for hydrocarbon recovery for decades, but has become widespread in North America due to a modern process known as horizontal slick water fracking
Recently lowered exposure limit guidelines for H2S, SO2 and NO2 have forced many instrument users to revisit where to set the alarms in their atmospheric monitors.
