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Fencing and signs like these near Dragoon, Arizona, aim to keep people away from some of the state’s estimated 100,000 abandoned mines. Minerals from such mines, many abandoned decades before environmental laws imposed clean-up requirements on mine owners, can leach out and pose a threat to nearby waterways.

Arizona could have as many as 100,000 abandoned mines, many leaching toxic minerals into the state’s waterways, and state environmental officials said cleanup has been hampered by the fear of litigation - but a proposed federal “good Samaritan” law could help address the issue. Read more»

Arizona Department of Environmental Quality Director Misael Cabrera, foreground, told a House committee that the EPA’s new ozone guildelines could end up winding U.S. cities for pollution generated elsewhere, among other problems.

The director of the Arizona Department of Environmental Quality told lawmakers Thursday that new air-quality standards will burden rural communities, like many in Arizona, by holding “rural counties accountable for pollution they did not create.” Read more»