It is the employer’s responsibility to identify workplace hazards, establish a written respiratory program and provide employees with appropriate respiratory protection.
It's often the things you can't see that end up hurting you the most. Take, for instance, the dust that pours into the air while you drill into rock. The silica doesn't seem harmful at first, but continuous exposure to it is extremely fatal.
The California Department of Industrial Relations’ Occupational Safety and Health Standards Board (Cal/OSHA) has adopted a regulation requiring employers to provide respiratory protection to all employees working outside for longer than one hour when the air quality index (AQI) reaches 151 or greater.
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