Unfortunately, in 80% of schools, the unhealthy indoor environment has adverse effects on students’ performance. Moreover, due to the CORONA pandemic, there is a chance of the virus spreading in the schools and childcare centres. Therefore, an effective air cleaning mechanism is critical to ensure the safety of the students and children. From our many years of experience in combating bacteria, particulate matter and virus particles, we know that installing a good (mobile) air cleaner is a practical solution to improving air quality.