Air purifiers alone cannot prevent viral spread in schools, say experts

Using advanced digital droplet PCR technology, researchers tested air samples for 19 common respiratory viruses, including influenza, rhinovirus, adenovirus, and SARS-CoV-2. They found that respiratory viruses were present in 98.5% of all samples, with exposure levels peaking in winter — a pattern similar to Delhi, where respiratory infections surge during the polluted season.