Scientific Assessment of Ozone Depletion: 2010

Find information on the latest research on ozone depletion.
Ozone depletion

Study: Ozone Layer’s Future Linked Strongly to Changes in Climate
"The ozone layer — the thin atmospheric band high-up in the stratosphere that protects living things on Earth from the sun’s harmful ultraviolet rays, not to be confused with damaging ozone pollution close to the ground — faces potential new challenges even as it continues its recovery from earlier damage, according to a recently released international science assessment. The report, prepared by the Scientific Assessment Panel of the U.N. Montreal Protocol on Substances that Deplete the Ozone Layer, also presents stronger evidence that links changes in stratospheric ozone and the Earth’s climate..."

EPA Report: 22 Million Cataract Cases Will Be Prevented by Stronger Ozone Layer Protection
"The U.S. Environmental Protection Agency marked the beginning of Cataract Awareness Month by announcing a new peer-reviewed report predicting that more than 22 million additional cataract cases will be avoided for Americans born between 1985 and 2100 due to the Montreal Protocol. The environmental treaty, signed by 196 countries, was designed to reduce and eventually eliminate ozone depleting substances. Too much UV radiation not only increases the risk for skin cancer, but also increases the risk for cataracts -- a clouding of the eye’s lens that affects more than 20 million Americans age 40 and older.

“Since the 1970s, we have prevented millions of skin cancer cases and deaths through our work protecting the ozone layer,” said Gina McCarthy, assistant administrator for EPA’s Office of Air and Radiation. “I am excited to kick off Cataract Awareness Month by announcing that the science has now enabled us to estimate our impact on cataracts.”

Due to the success of the Montreal Protocol, the ozone layer is predicted to recover to pre-1980 levels after 2065. In the meantime, under a compromised ozone layer, more ultraviolet (UV) radiation reaches the Earth’s surface. While treatment for cataracts is widely available in the U.S., the costs are high, with direct medical costs estimated to be $6.8 billion per year..."

Estimating Mortality Risk Reduction and Economic Benefits from Controlling Ozone Air Pollution
"January 6, 2010 – The Environmental Protection Agency has proposed to strengthen the national ambient air quality standards for ground-level ozone. Ground-level ozone is a primary component of smog. The proposed revisions are based on scientific evidence about ozone and its effects on people and sensitive trees and plants. EPA will accept comments for 60 days following publication of the proposal in the Federal Register."

Scientific Assessment Presents Status, Expectations for Ozone Layer
"A new NOAA-led assessment of the global ozone layer says the U.S. has reduced by 97-98 percent the production of ozone damaging substances since the late 1980s. The assessment is one in a series of synthesis and assessment reports coordinated by the U.S. Climate Change Science Program.

The report also offers a glimpse into expectations for recovery of the ozone layer in a changing climate, as well as the first detailed look at U.S. role in emitting — and reducing the emissions of — the chemicals that deplete the ozone layer. The ozone layer, which surrounds the globe about 10-15 miles above the surface, protects living things from the sun’s harmful ultraviolet rays..."

EPA Hearing on National Ambient Air Quality Standards
"The Committee held holding a hearing titled, “EPA’s New Ozone Standards” at 1 p.m. on Tuesday, May 20, 2008, in 2154 Rayburn House Office Building.

The hearing examined the new ozone national ambient air quality standards (NAAQS) and the process the Environmental Protection Agency used in setting them.

On March 12, 2008, EPA Administrator Stephen L. Johnson finalized updated NAAQS for ozone, a primary component of smog. The new ozone NAAQS are comprised of a revised primary standard to protect health and a revised secondary standard to protect the environment. In setting both standards, EPA Administrator Johnson did not accept the recommendations provided to him by EPA’s independent scientific review committee, the Clean Air Scientific Advisory Committee (CASAC). With regard to the secondary standard, Administrator Johnson’s efforts to set a new standard were overruled by the White House."

Strengthened National Standards for Ground-Level Ozone
"The Environmental Protection Agency significantly strengthened its national ambient air quality standards (NAAQS) for ground-level ozone, the primary component of smog. These changes will improve both public health protection and the protection of sensitive trees and plants."