if 20 milliseverts per year is the correct level for evacuation then why do we not evacuate Kerela in India, Ramsdar in Iran. Kerela has radiation levels 3 time

if 20 milliseverts per year is the correct level for evacuation then why do we not evacuate Kerela in India, Ramsdar in Iran. Kerela has radiation levels 3 times higher than 20 milliseverts per year. Denver has higher background radiation than most places in the US. Higher altitude and higher radon levels. They are not quite to 20 milliseverts per year unless they have more radon in their house which some do. Flight crews get 3.1 milliseverts per year. About 50 days worth of Fukushima exposure. Air pollution causes 7 million deaths per year. 4 million from outdoor air pollution. The hospitalization rate increases on the bad air days. The effect is immediate for many elderly and asthmatics. Air pollution levels in some cities in India, China and other parts of Asia is like forcing everyone (including babies and the elderly or asthmatics) to smoke 6+ cigarettes a day. Being barely able to breath is very unpleasant and scary. 12,000 people died over 2 weeks in 1952 during the London Fog air pollution event. Atmospheric inversion trapped air pollution. People dropped dead with blue lips and their last few minutes to hours were spent gasping for breath. 144 people were killed in 1966. During the Aberfan disaster. Millions of tons of coal mine waste were left in piles on a mountain. A heavy rain caused the mine waste to slide down the mountain and into the town of Aberfan. It buried a school. 117 children dead. https://www.nextbigfuture.com/2011/03/aberfan-coal-disaster-where-school-was.html https://www.nextbigfuture.com/2011/03/aberfan-coal-disaster-... Multiple incidents where over 100 people get burned alive in oil tanker spills. 150+ in Pakistan in 2017. Poor people ran towards on oil tanker spill to scoop up oil from a leak. Then it caught fire and they were burned alive. 8 billion tons of coal is moved every year. 1000+ die mining it. Many die underground slowly when they are trapped in collapsed coal mines. 40% of freight trains and trucks move coal. So almost all freight train and truck accidents in certain areas are people being hit by a vehicle loaded with coal. 5 billion tons of oil per year. Norway is big into oil and gas. $62 billion for the BP oil spill in the Gulf of Mexico.