Scott G Winteton, Deseret News
SALT LAKE CITY — Just as the first Red Day of the winter season was announced, state officials Monday unveiled plans to abandon the time-tested, three-color air quality alert system.
Green, Yellow and Red Day declarations have guided Utahns through the winter air pollution season for the past two decades. Beginning in January, the state will move to a six-color system that attempts to more precisely delineate the health risks at each level of pollution.
"We're actually making it more effective," said Bryce Bird, director of the state's Division of Air Quality.
But the new six-color system is already drawing fire.
"I don't think anyone's interests are served by having the public confused about the issue," said Dr. Brian Moench, president of Utah Physicians for a Healthy Environment.
The forecast of a Red Day today applies to Salt Lake, Weber and Davis counties. It resulted from a typical winter phenomenon: A temperature inversion traps colder air in the valleys, and the stagnant air gets thicker and thicker with smog from cars, industry and wood-burning stoves.
Since the early 1990s, Utah has used a simple green-yellow-red system to describe the worsening conditions. On a Red Day, residents are ordered to shut down wood-burning stoves and motorists are encouraged to drive less.
That system, coupled with fines for people who ignore the no-burn orders, have been highly effective, according to the state's air quality monitoring chief, Bo Call. During temperature inversions, officials can smell wood smoke on the filters at air monitoring stations.
"Back in the day, they would just reek of wood smoke — just like you'd been right there, right around a campfire," Call said.
Today when an inversion kicks in, the smell on the filters fades in the days following a declaration of a Red Day alert, he said.
"When we say it's a no-burn, people really do quit burning," Call said.
Part of the intent of the new system, state officials say, is to get warnings out earlier so people will cut back on polluting activities before an inversion gets serious. The six-color scheme is also aimed at letting individuals know when their own health is at risk.
Amanda Smith, executive director of the Utah Department of Environmental Quality, said the old three-color system caused problems for the public.
"It has been confusing for people who thought that the red meant that it was unhealthy," Smith said. "Really what the red meant was that it was a mandatory no-burn day in winter."
The new system is an attempt to separate the two issues. At higher levels of pollution, there will be health warnings that discourage people from outdoor exercise. But at lower, "moderate" levels, there will be action alerts to encourage people to cut back on polluting activities.
"And so the result of that will be that we're calling those days earlier in the inversion period," Bird said.
The level that would trigger a Red Day alert under the old system, 35 micrograms of particulate pollution per cubic meter of air, will now be considered an Orange Day. Utahns will be warned that it's "unhealthy for sensitive groups," such as people with lung disease, older adults and children.
The Red Day level will be set at 55 micrograms per cubic meter. That amount of pollution will be labeled "unhealthy," meaning anyone could begin to experience adverse health effects.
At lower levels of pollution, however, the new system will trigger voluntary and mandatory actions. At 15 micrograms per cubic meter, the state will declare a Yellow Day, calling for voluntary cutbacks in wood-burning and driving. If small-particle pollution exceeds 25 micrograms, wood-burning restrictions will become mandatory.
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