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Air Pollutants and High Blood Pressure


For most of the year, Utah’s air quality is among the best in the nation, but when high pressure builds up for extended periods of time in the summer and winter, inversions develop in the Salt Lake and other valleys that lead to poor air conditions. Poor air quality not only limits our ability to enjoy Utah’s natural surroundings and spend time outside, it impacts the health of Utah’s population. Check out the latest evidence in the story below that shows that poor air quality is not only bad for your lungs, it’s bad for your heart as well!

Exposure to air pollutants linked to high blood pressure


For your heart’s sake, limit your time outdoors when pollution levels are high.

That’s the conclusion of researchers who recently found that short- and long-term exposure to air pollutants from coal burning, vehicle exhaust, airborne dust and dirt are associated with the development of high blood pressure – a major risk factor for heart disease and stroke.

“People should limit their exposure on days with higher air pollution levels, especially for those with high blood pressure,” said epidemiologist Tao Liu, Ph.D., lead author of the study published in the American Heart Association journal Hypertension. “Even very short-term exposure can aggravate their conditions.”

In the first study to simultaneously estimate the effects of short- and long-term exposure to air pollutants on high blood pressure by meta-analysis, researchers focused on these air pollutants:

  • Sulfur dioxide (SO2) mainly comes from the burning of fossil fuel.
  • Nitrogen oxide (NO2) comes from fossil fuels burned at power plants and vehicle exhaust.
  • Particulate matter (PM) are in the air and include dust, dirt, smoke and liquid droplets. (PM 2.5 is smaller than a speck of dust and is the most common and hazardous type of air pollution. PM10 includes PM2.5 and PM2.5-10).

In the study, high blood pressure was significantly associated with short-term exposure to SO2, PM2.5 and PM10 and long-term exposure to NO2, which is produced from combustion, and PM10.

Researchers didn’t find significant short-term effects of ozone and carbon monoxide exposure.

Meta-analyses combine results from previous studies to estimate the overall effect of a particular variable on a result. Of 5,687 air pollution studies, researchers focused on 17 that included more than 108,000 people with high blood pressure and 220,000 people without high blood pressure.

Researchers defined high blood pressure as a systolic blood pressure of more than 140 mm Hg and/or a diastolic blood pressure of more than 90 mm Hg, or by use of high blood pressure medication. They assessed air pollution exposure by averaging data from the nearest air pollution monitoring stations or using complex dispersion models or land use regression models.

Previous studies have indicated that air pollution might be a risk factor for hypertension, but the results were controversial, said Liu, deputy director of the environmental health division at Guangdong Provincial Institute of Public Health in China. The mechanism by which air pollution could contribute to the development of high blood pressure includes inflammation and oxidative stress, which may lead to changes in the arteries.

“Next, we plan to further delve into the effects of particulate matter and their sources on hypertension risk, which we hope will inform air pollution control policymakers,” Liu said.

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