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611 W. Union Street
Benson, AZ 85602
(520) 586-0800

AzCH Nurse Assist Line
1-866-495-6735

NAZCARE Warm Line
1-888-404-5530


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Some Cities' Smog Can Ruin Your Vacation

HealthDay News
by -- Robert Preidt
Updated: Dec 3rd 2019

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TUESDAY, Dec. 3, 2019 (HealthDay News) -- Got travel plans abroad? Spending just a short time in a highly polluted city can harm your health, researchers warn.

"It's widely known that long-term exposure to air pollution is associated with increased cardiovascular disease. But it was unknown whether a short-term visit to a location with severe air pollution could have any significant impact," study lead author Dr. Jesus Araujo said in a University of California, Los Angeles news release.

Araujo is a professor of medicine and director of environmental cardiology at UCLA's David Geffen School of Medicine.

The study included 26 nonsmoking healthy adults from Los Angeles who spent 10 weeks in Beijing during the summers of 2014 and 2015. Their average age was about 24.

Participants were divided into two groups. Blood samples were taken from the first group after eight weeks in Beijing and from the second group after six weeks in the Chinese capital city.

Both groups had significant negative health changes during their time in Beijing. These included higher levels of oxidized fats that increased heart inflammation, and a change in enzyme function, which is associated with heart disease.

The researchers also found that the participants had up to an 800% greater concentration of air pollutants in their bodies while in Beijing than they did when in Los Angeles.

However, most of the negative health effects reversed within four to seven weeks after their return to Los Angeles, according to the study. The results were recently published in the journal Circulation.

During the study, the concentration of airborne particles in Beijing averaged 371% higher than in Los Angeles.

"It's likely that the health effects would be even more prominent after longer exposure to air pollution, repetitive travels, or among individuals with preexisting health conditions," said study first author Yan Lin, a postdoctoral associate at Duke University's Global Health Institute in Durham, N.C.

Beijing is among many highly polluted cities that attract millions of tourists and business travelers each year, the researchers noted. They suggested ways to reduce the risk of health problems when visiting seriously polluted cities:

  • Avoid intense physical activity such as running outdoors or hiking.
  • If you have a heart condition, keep your visits to these cities short.
  • If you must stay for an extended period, stay indoors as much as possible with air purifiers running.

More information

The World Health Organization has more on air pollution.