Shopping malls and offices are crowded without strong air circulation, where high level of CO₂ and PM2.5. pollution make people suffer from drowsiness, headaches and inability to keep concentration.

A healthy indoor air quality is shown to increase office productivity by 10%¹, according to the study from the Technical University of Denmark by indoor climate scientists Pawel Wargocki and David P. Wyon. People prefer to shop in malls with good ventilation and comfortable temperature. Air quality is invisible but influences consumer traffic.

Traditional ventilation system can solve the problem of high CO₂ , but lacks purification and sterilization function. During the flu season, cross-infection can be easily found in office with air-condition on, but window closed. When the situation of COVID-19 gets better and workers go back to office, central air-conditioning system (with air flow returned) was not recommended to turn on, despite the weather is still quite cold in February.

Many companies delayed the time work resumption because of the risky indoor environment. Fresh air system with purification function has its significant advantages during this special period. The system provides more oxygen to office while windows are closed. It removes bacteria and viruses and works along with air-conditioning system, creating a comfortable and healthy environment for staff to work.

1. Study Report: Impact of the Indoor Environment on Learning in Schools in Europe