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Is aq a safety industry standard or a mandatory standard?
Mandatory safety industry standard code: AQ;

Recommended safety industry standard code: AQ/T.

There are many mandatory standards in the safety industry, but not all of them are mandatory standards, and some are recommended standards. For example:

AQ/T 1099-20 14 guidelines for the construction of coal mine safety culture.

AQ/T1104-2014 Technical specification for safe transportation of low concentration gas-water two-phase flow in coal mines.

Aq/t1105-2014 mine rescue protective clothing

AQ/T 3005-2006 Implementation Guide for Safety Management of Petrochemical Construction Managers