According to article 1.0.4 of the Standard for Indoor Environmental Pollution Control of Civil Building Engineering (GB 50325—2020), the division of civil building engineering should meet the following requirements: Class I civil buildings should include houses, functional apartments, hospital wards, residential facilities for the elderly, kindergartens, school classrooms, student dormitories, etc. Class II civil buildings should include office buildings, shops, hotels, cultural and entertainment venues, bookstores, libraries, exhibition halls, gymnasiums, public transport waiting rooms, restaurants, etc.