In the late 2000s, questions emerged about whether hydrogen cyanide (HCN) emissions from gold mining cyanide leach operations could pose a risk to nearby communities. Rather than relying solely on conservative assumptions or modeling, the U.S. Environmental Protection Agency (EPA) invoked its authority under Clean Air Act Section 114 to request real-world data. In response, Air Sciences, working closely with the Nevada Mining Association (NvMA) and its member companies, spearheaded a comprehensive ambient monitoring program designed to answer a simple but critical question: What are the actual ambient concentrations of HCN at the fence line of operating gold mines?
Owens Lake, located in eastern California’s Owens Valley, has undergone a remarkable transformation from a once dust-prone landscape to one of the largest and most successful air quality restoration projects in the world. Once an area that generated severe dust (PM10) pollution and health risks for surrounding communities, Owens Lake is now a model for environmental recovery and sustainable management.
Meteorological station data remains one of the best tools for informing avalanche safety decisions. For recreationists and practitioners alike, everyone requires information specific to their plan for the day. But parsing through large station networks is often tedious, and information overload can actually limit the amount of information we internalize. Additionally, few recreationists understand the complexities at each station and looking at less than ideal data can be misleading.