Bryan Johnson, an American entrepreneur and a venture capitalist, had arrived in India as a guest in Nikhil Kamath’s podcast but had to leave midway as he could not bear Mumbai’s “bad air quality”. By his third day in the country, Johnson's “skin break out in rash”, and his eyes and throat burned. The air quality index (AQI) in Mumbai at that time was just 130. For Indians, especially Delhiites, far worse air quality is an every day affair.