Rise in demand for air filters after increase in COVID-19 cases | Video Singapore 22 May 2021 10:57PM (Updated: 22 May 2021 11:00PM) Demand for air purifiers has gone up in Singapore after World Health Organization said that people may get infected with the coronavirus through airborne droplets. One expert, however, said it is not necessary for homes to have better air filters. Liang Lei reports. Tagged Topics