This app has been conceptualized and developed by two students of Bharti Vidyapeeth in Delhi. The creators, Prerna Khanna and Tanmay Srivastava also won a cash prize of $1500 (Rs 1,09,500) last month at the Marconi Society Awards organized in India. The real-time air quality analytics app lets users take a photo (half of it should have the sky) and using image processing techniques the app will give them details about the air quality in the area. “These image features are chosen to match with the human perception of colour and texture of the sky. Further, machine learning techniques are applied to estimate the air quality index (AQI) of the image captured by the user. To increase our accuracy we even combine meteorological features like humidity,” says Khanna.