Delhi teenager Krish Aggarwal, co-founder of Project Vayu, has developed a Rs 140 filter that turns ordinary fans into air purifiers. Designed for easy installation, the filter captures PM2.5 particles and offers schools an affordable way to improve indoor air quality. The initiative has benefited over 10,000 students and earned Krish the 2026 Diana Award." name="description">window.pageLoadStarted = (new Date()).getTime().