Featured Research

from universities, journals, and other organizations

Ground-Level Ozone Linked To Increased Mortality

Date:
November 17, 2004
Source:
Johns Hopkins Bloomberg School Of Public Health
Summary:
Changes in ground-level ozone were significantly associated with an increase in deaths in many U.S. cities, according to a nationwide study conducted by researchers at the Johns Hopkins Bloomberg School of Public Health and the Yale University School of Forestry and Environmental Studies.

Changes in ground-level ozone were significantly associated with an increase in deaths in many U.S. cities, according to a nationwide study conducted by researchers at the Johns Hopkins Bloomberg School of Public Health and the Yale University School of Forestry and Environmental Studies. The risk of death was similar for adults of all ages and slightly higher for people with respiratory or cardiovascular problems. The increase in deaths occurred at ozone levels below the Environmental Protection Agency (EPA) clean air standards. The study appears in the November 17, 2004, edition of the Journal of the American Medical Association (JAMA.)

Ground-level ozone is a pollutant in the Earth's lower atmosphere that is formed when emissions from cars, power plants and other sources react chemically to sunlight. Stratospheric ozone, which is higher in the atmosphere, is the “ozone layer” that protects the Earth from ultraviolet radiation.

“This is one of the largest ozone pollution studies ever conducted,” said lead author Michelle Bell, PhD, who was previously with the Bloomberg School of Public Health and is now an assistant professor at the Yale School of Forestry and Environmental Studies.

The ozone study was part of the ongoing National Morbidity Mortality and Air Pollution Study (NMMAPS) at the Bloomberg School of Public Health, which routinely assesses health effects of air pollution on a national scale. To determine the association between ozone and mortality, the researchers looked at the total number of non-injury-related deaths and cardiovascular and respiratory mortality in the 95 largest U.S. communities from 1987 to 2000. Air pollution data were supplied by the EPA. Mortality data were supplied by the National Center of Health Statistics. The researchers accounted for variables such as weather, particulate matter pollution and seasonality, which could impact mortality rates.

The researchers found that an increase of 10 parts per billion (ppb) in weekly ozone levels was associated with a 0.52 percent daily increase in deaths the following week. The rate of daily cardiovascular and respiratory deaths increased 0.64 percent with each 10 ppb increase of weekly ozone. The average daily ozone level for the cities surveyed was 26 ppb. The EPA’s maximum for ground-level ozone over an 8-hour period is 80 ppb. The researchers calculated that a 10 ppb reduction in daily ozone, which is roughly 35 percent of the average daily ozone level, could save nearly 4,000 lives throughout the 95 urban communities included in the study.

“Our study shows that ground-level ozone is a national problem, which is not limited to a small number of cities or one region. Everyone needs to be aware of the potential health risks of ozone pollution,” said Francesca Dominici, PhD, senior author of the study and associate professor in the Department of Biostatistics at the Bloomberg School of Public Health.

The data and statistical models used to complete the study are available on the Health and Air Pollution Surveillance System website at www.ihapss.jhsph.edu. The site is maintained by the Johns Hopkins Bloomberg School of Public Health and sponsored by the Health Effects Institute.

“Ozone and Short-Term Mortality in 95 U.S. Urban Communities, 1987-2000” was written by Michelle L. Bell, PhD; Aidan McDermott, PhD; Scott L. Zeger, PhD; Jonathan M. Samet, MD; and Francesca Dominici, PhD.

Funding was provided by grants from the U.S. Environmental Protection Agency, the National Institutes for Environmental Health Sciences, NIEHS Center for Urban Environmental Health and the Health Effects Institute.


Story Source:

The above story is based on materials provided by Johns Hopkins Bloomberg School Of Public Health. Note: Materials may be edited for content and length.


Cite This Page:

Johns Hopkins Bloomberg School Of Public Health. "Ground-Level Ozone Linked To Increased Mortality." ScienceDaily. ScienceDaily, 17 November 2004. <www.sciencedaily.com/releases/2004/11/041116215122.htm>.
Johns Hopkins Bloomberg School Of Public Health. (2004, November 17). Ground-Level Ozone Linked To Increased Mortality. ScienceDaily. Retrieved September 19, 2014 from www.sciencedaily.com/releases/2004/11/041116215122.htm
Johns Hopkins Bloomberg School Of Public Health. "Ground-Level Ozone Linked To Increased Mortality." ScienceDaily. www.sciencedaily.com/releases/2004/11/041116215122.htm (accessed September 19, 2014).

Share This



More Earth & Climate News

Friday, September 19, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Raw: Wildfires in CA Burn Forest Asunder

Raw: Wildfires in CA Burn Forest Asunder

AP (Sep. 18, 2014) An out-of-control Northern California wildfire has nearly 2,800 people from their homes as it continues to grow, authorities said Thursday. Authorities said a man has been arrested on suspicion of arson for starting the fire on Saturday. (Sept. 18) Video provided by AP
Powered by NewsLook.com
Raw: Elephant Undergoes Surgery in Tbilisi Zoo

Raw: Elephant Undergoes Surgery in Tbilisi Zoo

AP (Sep. 18, 2014) Grand the elephant has successfully undergone surgery to remove a portion of infected tusk at Tbilisi Zoo in Georgia. British veterinary surgeons used an electric drill to extract the infected piece. (Sept. 18) Video provided by AP
Powered by NewsLook.com
Raw: Scientists Examine Colossal Squid

Raw: Scientists Examine Colossal Squid

AP (Sep. 16, 2014) Squid experts in New Zealand thawed and examined an unusual catch on Tuesday: a colossal squid. It was captured in Antarctica's remote Ross Sea in December last year and has been frozen for eight months. (Sept. 16) Video provided by AP
Powered by NewsLook.com
Man Floats for 31 Hours in Gulf Waters

Man Floats for 31 Hours in Gulf Waters

AP (Sep. 16, 2014) A Texas man is lucky to be alive after he and three others floated for more than a day in the Gulf of Mexico when their boat sank during a fishing trip. (Sept. 16) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins