Nationally, the science advocacy group found the added ozone pollution related to climate change could trigger as many as 2.8 million additional serious respiratory illnesses at a cost of about $5.4 billion. The climate-related pollution also could mean an additional 5,100 infants and seniors hospitalized with serious breathing problems and 944,000 additional missed school days in the United States in 2020.
"It's clearly a problem," said the group's Rachel Cleetus, "and it's likely to get worse."
Ozone pollution is different from the "ozone layer," which is about 10 to 20 miles above the earth and protects it from the sun's harmful rays.
Ground-level ozone is typically a summertime problem in Utah's urban areas, where chemicals and engines release pollutants that, when cooked in the sun and heat, become ozone pollution. And when ozone builds up on sunny afternoons, it causes what doctors describe as a kind of sunburn on the lungs, triggering asthma attacks, coughing and poor lung function.
The scientists' study assumes that projected temperature increases will boost ozone concentrations by about 2 parts per billion. The current limit for ozone is 75 parts per billion.
Although Utah met federal ozone limits for years, tougher new standards are likely to mean the state will have to develop plans for reducing the pollutants that lead to ozone problems. Additionally, the U.S. Environmental Protection Agency has been reviewing the prospect of still tougher limits and is expected to release its decision within weeks.
Michelle Hofmann, a Salt Lake pediatrician who has worked on strategies to deal with asthma, was not surprised by the link made in the new health-impacts report.
"We know ozone concentrations will increase with climate change, and presumably so will health impacts," she said.
The report is based on analysis of climate trends (both observed and modeled), economics and health studies. It was reviewed by experts in those fields before the Union of Concerned Scientists released it in June.
The report said California would suffer most in terms of cost. Others feeling the biggest cost impacts would be Texas, New York, Pennsylvania, Illinois, Ohio, Michigan, North Carolina, New Jersey and Virginia.
In Utah, the report estimated that by 2020 the number of added acute respiratory episodes would range from 15,995 to 46,852. Added costs would range from $7.8 million to $107.2 million.
O To see the report on climate change and its ozone-related impacts on health, see the Web page • bit.ly/kknWVP