As Sierra Snowpack Collapses, Mono Lake Increasingly Source Of Dust Rather Than Water
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Since 1994, a landmark State Water Resources Control Board decision has capped L.A.s diversions of the streams that feed Mono Lake, defusing for a time one of Californias most protracted environmental battles. Scientists say climatic shifts, however, are bringing less snow to the Sierra Nevada and less snowmelt to Mono Lake. That means if Los Angeles keeps taking its allocated share, it will lead to a decline in lake levels and increased health risks for those exposed to windblown dust from the receding shoreline, according to the Great Basin Unified Air Pollution Control District.
To protect Mono Basins ecosystem and airshed, regulatory officials say, will require drafting new predictive models of precipitation, temperature and evaporation rates to control diversions into an aqueduct system that has transformed the ancient brine lake into the largest source of powder-fine air pollution in the United States.
Of particular concern are particulates of 10 microns or less, which are regulated by state and federal laws because they can lodge deep in the lungs, causing respiratory injuries. Dust storms at Mono Lake exceeded federal health standards 33 times in 2016, officials said.
The Los Angeles Department of Water and Power takes issue with the Great Basin districts warning that more restrictive measures may be needed to meet clean air standards. Were headed for a showdown with Los Angeles; no doubt about it, said Phillip Kiddoo, air pollution control officer at Great Basin.
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http://www.latimes.com/local/california/la-me-mono-lake-dust20180705-htmlstory.html