Eerie pictures of Sao Paulo being blanketed in thick smoke from Amazon wildfires are going viral, with many concerned that a surge in deforestation is wreaking environmental disaster Sao Paulo - which is Brazil's largest city - was plunged into darkness around midday on Monday, with monitoring data from the World Meteorological Organization showing a large smoke plume spreading south-east to the Atlantic. Pictures taken around 4.30pm show that cars ...