Srinagar, Dec. 11 -- A recent video from Kashmir shows a tourist stepping into the Valley's misty morning and declaring the air "so polluted." Social media joked about it, but the moment reflects a deeper loss: Many urban Indians have forgotten what clean air looks and feels like. For people in Delhi and other metros, haze automatically signals danger. Daily life revolves around AQI charts, air purifiers, and "poor" or "severe" alerts. We've grown so used to toxic skies that our senses can no longer distinguish natural fog from harmful smog.Fog is simply condensed water vapour-nature's own winter curtain. Smog is its chemical twin, formed by vehicle emissions, dust, and industrial pollutants. But in our cities, decades of grey mornings ha...