Land Letter headlines —



Winter ozone problem continues to mystify regulators, industry

The mystery behind the wintertime ozone problem that has plagued parts of the Intermountain West is deepening as pollution levels during the first quarter of 2011 dropped in northeast Utah but increased in southwest Wyoming.

Ground-level ozone exceeded federal health standards in northeast Utah's Uintah Basin on 26 days between January and March, according to air monitoring data compiled by U.S. EPA. That figure was down from 37 days of ozone exceedances recorded in the basin for the first three months of 2010.

But in Wyoming, after two years of clean winter air in the Upper Green River Basin, EPA monitors registered 13 days between January and March when ozone levels exceeded the eight-hour health standard of 75 parts per billion (ppb). That includes a March 2 ozone reading of 124 ppb -- higher than the worst ozone levels recorded last year in Los Angeles.

And even though the Uintah Basin saw fewer bad ozone days early this year, the region did experience significant ozone spikes on days when the pollutant was a problem. That included a Feb. 16 eight-hour average of 146 ppb, nearly twice the federal standard and potentially dangerous for even healthy adults to breath, said Carl Daly, chief of the air permitting, modeling and monitoring unit in EPA's Region 8 office in Denver.

New This Week

News Roundup


E&E Special Reports

Campaign 2020
Climate in the Courts: Juliana v. United States
Off Topic
E&E News Highlights
Deepwater Horizon: 10 Years Later
Recipe For Change
EPA: Open for Business
Shifting Precedent: The Climate Battle in the West
People to Watch 2020
2020 Hindsight
Bloodbath: Red ink pours over Northwest dams
California's Crumbling Coast
Ice Bound
Green New Deal
WOTUS in the West

E&E Services

Learn More About E&E
Start a Trial
Receive Email Alerts
Staff Directory
Employment Opportunities


Latest Selected Headlines

More headlinesMore headlines

More headlinesMore headlines

More headlinesMore headlines

More headlinesMore headlines