Dying lakes release dust, often polluted dust, that is literally killing people who can’t afford to move.
Though we often think of lakes as permanent landmarks, global warming, irrigation, and our constant thirst threaten these resources around the world. Terminal lakes like the Salton Sea, bodies of water that have no natural drain, are particularly vulnerable. Iran’s Lake Urmia — once the largest body of water in the Middle East — has shrunk by almost 90 percent over the last 30 years; Africa’s Lake Chad is also 90 percent smaller than it was in the 1960s; and Kazakhstan’s Aral Sea, once the fourth largest salt lake in the world, has practically been wiped off the map.
When these lakes evaporate, they can upend industries and erase surrounding communities. For residents near the Salton Sea, the most pressing problem is the threat of toxic dust. The receding Salton Sea will reveal at least 75 square miles of playa, the lake bed that the water once hid. When that soil dries, it will begin to emit dust laced with industrial runoff from the surrounding farms: up to 100 tons of dust could blow off the playa daily. If it isn’t captured, that dust will push the area’s asthma crisis from bad to dire. The Salton Sea is a dust bomb that has already begun going off.
Source: As California’s largest lake dries up, it threatens nearby communities with clouds of toxic dust – The Verge