T/YJX 011-2024 Standard for Evaluating the Indoor Air Environment Quality of Civil Buildings

Scope

Scope: This document specifies the requirements, testing methods, and grading evaluation for the indoor air environment quality of civil buildings. This document is applicable to the evaluation of indoor air environment quality in civil buildings, and other indoor environments can refer to it for implementation. Main technical content: 3. Terms and definitions: The terms and definitions defined in GB/T 18883 apply to this document. 4. Requirements 4.1 The indoor air of civil buildings should be non-toxic, harmless, non-irritating, and free from abnormal odors. 4.2 The indoor air environment quality indicators and limits of civil buildings shall comply with the relevant provisions of GB/T 18883, GB 37488, GB 50325, and WS 10013. 4.3 The indoor air environment quality of civil buildings is divided into three grades according to Table 1: - Grade AAAA: Excellent air environment quality; - Grade AAA: Good air environment quality; - Grade A: Passing air environment quality. 3. Table 1: Grading of indoor air environment quality in civil buildings Indicator Unit Grade AAA (Passing) Grade AAA (Good) Grade AAAA (Excellent) Average time 1 Formaldehyde mg/m3 0.08 0.06 0.03 1 h 2 Benzene mg/m3 0.03 0.02 0.01 1 h 3 Toluene mg/m3 0.2 0.15 0.10 1 h 4 xylene mg/m3 0.2 0.15 0.10 1 h 5 Total volatile organic compounds (TVOC) mg/m3 0.6 0.5 0.4 8 h 6 Ozone mg/m3 0.16 0.12 0.05 1 h 7 Ammonia mg/m3 0.2 0.15 0.1 1 h 8 Carbon dioxide % 0.1 0.09 0.08 1 h 9 PM2.5 mg/m3 0.05 0.035 0.015 24 h 10 PM10 mg/m3 0.1 0.075 0.05 24 h 11 Total bacterial count CFU/m3 1500 1000 500 — 12 Radon (222 Rn) mg/m3 150 125 100 Annual average (reference level) 13 Air negative (positive) oxygen ion concentration N/m3 Higher than outdoor air by 100 Higher than outdoor air by 300 Higher than outdoor air by 500

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