"the snow that blasted onto the mountain was yellow."

"the snow that blasted onto the mountain was yellow."

"Snowbowl’s manager, J. R. Murray, said the problem was caused by rusty residue in the new snow-making equipment that carries the wastewater from neighboring Flagstaff, where it is piped directly from the town’s sewage treatment plant."

Or, and call me crazy if you will, it could be because it is piped directly from the town’s sewage treatment plant.