Between a Rock and a Hard Place: The EPA Rule on Ozone Levels and the Intermountain West

The EPA Rule on Ozone Levels Recently, the US Environmental Protection Agency (the “EPA”) published an administrative rule that requires states to lower atmospheric ozone levels to 60-70 parts per billion. For states in the Intermountain West, where the level of naturally occurring ozone (or “background concentrations”) routinely reaches 60 – 75 ppb, it’s going to be tough to comply. According to National Oceanic and Atmospheric Administration-led research, it’s not a problem limited to inversion prone valleys like Salt Lake and Cache. “We expected we were going to see intrusions big enough, individual events, which would…