New Mexico

How visitation is affecting the air quality in Carlsbad Cavern Carbon dioxide is a naturally occurring gas in Earth’s atmosphere, but in high concentrations, the gas can act as an asphyxiant. OSHA and other government agencies recommend a 5,000 parts per million (ppm) workplace exposure limit of 8 hours...

I know that I’ve talked about the volcano before, but I don’t believe I adequately described what it’s like, physically.  It’s basically a mound of cinders and loose rocks.  It’s not nearly as solid as, say, the Rocky Mountains.  That means it erodes very quickly...