Navigation Links
Indoor air pollution increases asthma symptoms
Date:2/19/2009

A study by researchers at the Johns Hopkins University found an association between increasing levels of indoor particulate matter pollution and the severity of asthma symptoms among children. The study, which followed a group of asthmatic children in Baltimore, Md., is among the first to examine the effects of indoor particulate matter pollution. The results are published in the February 2009 edition of the journal Environmental Health Perspectives.

Particulate matter is an airborne mixture of solid particles and liquid droplets. The solid particles come in numerous shapes and sizes and may be composed of different chemical components. Fine particles measure 2.5 microns or less in size (approximately 1/30th the diameter of a human hair) and can penetrate deep into the body's respiratory system. Coarse particles fall between 2.5 and 10 microns in diameter. These larger particles can also enter the respiratory system and can be produced indoors through activities such as cooking and dusting. The U.S. Environmental Protection Agency (EPA) regulates outdoor levels of fine particle pollution, but does not have a standard for coarse particle pollution. There are no regulations for indoor pollution.

For the study, researchers from the Center for Childhood Asthma in the Urban Environmenta joint center of the Johns Hopkins Bloomberg School of Public Health and the Johns Hopkins School of Medicinefollowed 150 asthmatic children, ages 2 to 6, for six months. Environmental monitoring equipment was used to measure the air in the child's bedroom for over three three-day intervals. Air measurements were taken at the beginning of the study, after 3 months and again after 6 months. Ninety-one percent of the children who participated in the study were African-American, from lower socioeconomic backgrounds, and spent most of their time indoors.

"We found that substantial increases in asthma symptoms were associated both with higher indoor concentrations of fine particles and with higher indoor concentrations of coarse particles," said Meredith C. McCormack, MD, MHS, lead author of the study and an instructor with the Johns Hopkins School of Medicine.

For every 10 micrograms per cubic meter of air (ug/m3) increase in indoor coarse particle concentration, there was a 6 percent increase in the number of days of cough, wheeze, or chest tightness, after adjusting for a number of factors. For every 10 ug/m3 increase in fine particles measured indoors, there was a 7 percent increase in days of wheezing severe enough to limit speech and after adjusting for various factors, a 4 percent increase in days on which rescue medication was needed. In many cases, the level of indoor fine particle pollution measured was twice as high as the accepted standard for outdoor pollution established by the EPA.

"Children spend nearly 80 percent of their time indoors, which makes understanding the effects of indoor air very important," said co-author, Gregory B. Diette, MD, an associate professor in the School of Medicine and co-director of the Center for Childhood Asthma in the Urban Environment.

"Improving indoor air quality and lowering indoor PM concentrations may provide additional means of improving asthma health, especially for children living in inner cities," added co-author, Patrick Breysse, PhD, a professor in the Johns Hopkins Bloomberg School of Public Health and co-director of the Center for Childhood Asthma in the Urban Environment.


'/>"/>

Contact: Tim Parsons
tmparson@jhsph.edu
410-955-7619
Johns Hopkins University Bloomberg School of Public Health
Source:Eurekalert

Related biology news :

1. The Clorox Companys new indoor allergen product reduces common indoor allergens up to 90 percent
2. e-Science points to pollution solutions
3. Groundbreaking Canada-US study proves link between emissions and mercury pollution in fish
4. Groundbreaking Canada-US study proves link between emissions and mercury pollution in fish
5. Nutrient pollution drives frog deformities by ramping up infections, says CU-Boulder study
6. RIT to study air pollution and greenhouse gas emissions in the Great Lakes region
7. Time spent in car drives up air pollution exposure
8. Pollution from marine vessels linked to heart and lung disease
9. Local sources major cause of US near-ground aerosol pollution
10. ASU researchers use NASA satellites to improve pollution modeling
11. Fighting pollution the poplar way: Trees to clean up Indiana site
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:5/16/2016)... NEW YORK , May 16, 2016   ... authentication solutions, today announced the opening of an IoT ... to strengthen and expand the development of embedded ... provides an unprecedented level of convenience and security with ... to authenticate one,s identity aside from DNA. EyeLock,s platform ...
(Date:4/28/2016)... April 28, 2016 First quarter 2016:   ... 966% compared with the first quarter of 2015 The ... 589.1 M (loss: 18.8) and the operating margin was 40% (-13) ... Cash flow from operations was SEK 249.9 M (21.2) ... guidance is unchanged, SEK 7,000-8,500 M. The operating margin ...
(Date:4/15/2016)... , April 15, 2016 ... the,  "Global Gait Biometrics Market 2016-2020,"  report to ... http://photos.prnewswire.com/prnh/20160330/349511LOGO ) , ,The global gait biometrics ... of 13.98% during the period 2016-2020. ... angles, which can be used to compute factors ...
Breaking Biology News(10 mins):
(Date:6/27/2016)... -- Alex,s Lemonade Stand Foundation (ALSF), a leading national childhood ... state-of-the-art bioinformatics lab, using ,big data, to advance the ... Liz Scott , co-executive director of ALSF and ... Washington, D.C. , hosted by Vice ... of pediatric cancer research and awareness. ...
(Date:6/27/2016)...  Global demand for enzymes is forecast to ... $7.2 billion.  This market includes enzymes used in ... production, animal feed, and other markets) and specialty ... and beverages will remain the largest market for ... products containing enzymes in developing regions.  These and ...
(Date:6/27/2016)... 2016 /PRNewswire/ - BIOREM Inc. (TSX-V: BRM) ("Biorem" or "the ... major shareholders, Clean Technology Fund I, LP and Clean ... based venture capital funds which together hold approximately ... fully diluted, as converted basis), that they have entered ... equity holdings in Biorem to TUS Holdings Co. Ltd. ...
(Date:6/27/2016)... DIEGO , June 27, 2016  Sequenom, Inc. ... committed to enabling healthier lives through the development of ... Court of the United States ... courts that the claims of Sequenom,s U.S. Patent No. ... patent eligibility criteria established by the Supreme Court,s Mayo ...
Breaking Biology Technology: