LAHORE – Smog in Pakistan’s second-largest city Lahore has increased to alarming levels, and the Air Quality Index hovers around 400 mark. The toxic atmosphere in provincial capital is the recurrent situation and it even caused a so-called fifth season of smog that continues to affect the health and daily activities of residents. On Tuesday, Lahore again topped the charts of being the fmost polluted city in the world as the Air Quality Index (AQI) measured 399 today.