With Delhi's AQI touching 349 ahead of Diwali, concerns are mounting over the health impact of toxic air. In an interview with NDTV, renowned pulmonologist Dr Arvind Kumar highlights road dust and construction activity as major contributors to pollution. He questions the effectiveness of sprinklers when roads are left covered in dust and shares precautions for residents: avoid going outdoors where possible, use air purifiers indoors, skip outdoor exercise and wear a.