SURVEY OF INDOOR ENVIRONMENTAL QUALITY IN OFFICES DURING THE COVID-19 PANDEMIC (PART 1): COMPARISON OF INDOOR ENVIRONMENT AT TWO POINTS AND ASSOCIATION WITH COVID-19 COUNTERMEASURES

Indoor environmental qualities in offices during the COVID-19 pandemic were analyzed on the following 4 aspects.1. Indoor environments during the COVID-19 pandemic were measured in 20 office buildings, indicating that ventilation might have changed from pre-COVID-19.2. A comparison of the indoor environment in 2020 and 2021 showed an increase in CO2 concentrations.3. Occupancy rate and CO2 concentration had a positive correlation, indicating that workers’ return to offices in 2021 increased CO2 concentration.4. The relationship between countermeasures for COVID-19 and indoor environments was analyzed, indicating that mechanical ventilation system might be effective during the COVID-19 pandemic.