•    ISO, EN, GB/T, and ISHRAE specify multiple categories for IEQ values, while ASHRAE, SS and AS provide acceptable levels.
•    Reviewed standards on IEQ focus on the perception rather than productivity and well-being.
•    There is no integrated assessment of various IEQ-related dimensions in the standards.
•    Occupants adaptation is considered to a greater extent in thermal comfort-relates standards.
•    Regional differences in climate, building typology, and demographics are not adequately covered in international standards.

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