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Voluntary

ASTM International (formerly the American Society for Testing and Materials)

• E2625 – 09 – Standard Practice for Controlling Occupational Exposure to Respirable Crystalline Silica for Construction and Demolition Activities
• D4532 – Test Method for Respirable Dust in Workplace Atmospheres
• E1132 – Practice for Health Requirements Relating to Occupational Exposure to Respirable Crystalline Silica

American National Standards Institute (ANSI)

• ANSI /AIHAZ9.22001 Fundamentals Governing the Design and Operation of Local Exhaust Systems

National Institute for Occupational Safety and Health (NIOSH)

• Recommended Exposure Level (REL) of 50 µg/m3 (micrograms per cubic meter of air).

American Conference of Governmental Industrial Hygienists (ACGIH)

• Threshold Limit Value (TLV) for crystalline silica is 25 µg/m3 time weighted average (TWA).