Help Support EcoWatch
The best of EcoWatch, right in your inbox. Sign up for our email newsletter!
Air Pollution Linked to Risk of 'Silent' Miscarriage
A typical adult takes around 20,000 breaths per day. If you live in a megacity like Beijing, with many of those lungfuls you're likely to inhale a noxious mixture of chemicals and pollutants.
According to BreatheLife, the air in the Chinese capital is 7.2 times above safe pollution levels, based on guidelines set out by the World Health Organization.
For expectant mothers, that means an increase in the risk of "silent" miscarriages, suggests a new large-scale study published in Nature Sustainability.
Air pollution is already known to raise the risk of premature birth, low birth weight and life-threatening health complications for pregnant women, like preeclampsia, which is marked by high blood pressure, or gestational hypertension.
But its impact on "silent" or missed miscarriages — where the fetus died or did not develop, but has not been physically miscarried — has been more difficult to establish.
A Toxic Link
A collaborative effort from 16 different authors at several universities in China, the study retrospectively examined the records of more than a quarter million pregnant women in Beijing from 2009 to 2017 in light of the womens' exposure to air pollution.
Among the women whose clinical records were studied, 17,497 — which is 6.8% — were found to have experienced these types of miscarriages.
The researchers found the probability of missed miscarriages increased with higher concentrations of air pollutants, taking into consideration different ages, occupations and air temperature.
Women who were older than 39 when they became pregnant, as well as farmers and blue-collar workers, had a higher risk of a missed miscarriage associated with air pollution, the authors said.
The authors defined "air pollution" as consisting of four pollutants: fine particulate matter (referred to as particulate matter 2.5 or PM 2.5), sulfur dioxide, ozone and carbon monoxide, and calculated the levels based on historic data from Beijing's network of air monitoring systems.
As the authors point out, previous research had found that when pregnant women are exposed to air pollution over the long-term, pollutants are able to cross the maternal-fetal blood barrier and affect the fetus.
Ultrafine and Ultratoxic
Most human-made air pollutants are extremely small: Particulate matter is about the diameter of a hair, and ultrafine particulate matter is even smaller. It's so tiny, in fact, it can travel from the lungs into our blood and circulate in the brain.
The myriad harmful health effects of air pollution are well known and range from respiratory illnesses and children's cognitive decline to infertility, polycystic ovary syndrome and dementia. Nearly one million children die every year from pneumonia and half of those deaths are linked to air pollution.
The Chinese study is not the first to have found a link between air pollution and miscarriages — in February 2019, a study conducted in Salt Lake City in the U.S., published in the journal Fertility and Sterility, found a increase of 20 micrograms of nitrogen dioxide per cubic meter was associated with a 16% rise in the risk of miscarriage.
That study analyzed the records of around 1,300 women between 2007 and 2015 who presented to the emergency department after having miscarriages. It found the strongest link between air pollution and lost pregnancy was the level of nitrogen dioxide in the seven days preceding a miscarriage.
Five years ago, the Chinese government declared a somewhat controversial "war on pollution," but air pollution levels in many cities around the country are still extremely toxic.
With global greenhouse gas emissions showing no sign of slowing down, China is not the only country with an air pollution problem. The World Health Organization says 91% of the world's population now lives in cities where the air is toxic.
The authors of the study noted that they will need to do more research to understand how air pollution affects the fetus, including modeling a wide range of environmental conditions using more data sources, particularly to include land use and land cover.
Reposted with permission from our media associate DW.
EcoWatch Daily Newsletter
By Julia Conley
A federal judge in Washington, D.C. late Sunday struck down the Trump administration's proposed changes to the SNAP benefits program, potentially saving hundreds of thousands of people from losing badly needed federal food assistance.
<div id="e8d44" class="rm-shortcode" data-rm-shortcode-id="be49aabc36a5465eed30ca54f88f6b2d"><blockquote class="twitter-tweet twitter-custom-tweet" data-twitter-tweet-id="1318171686232096772" data-partner="rebelmouse"><div style="margin:1em 0">A judge has ruled in our favor and blocked the Trump administration’s unlawful changes to SNAP. This decision is… https://t.co/5zeTafxMLm</div> — NY AG James (@NY AG James)<a href="https://twitter.com/NewYorkStateAG/statuses/1318171686232096772">1603111595.0</a></blockquote></div>
<div id="f47ab" class="rm-shortcode" data-rm-shortcode-id="381daa45528adda7398d5628d047294f"><blockquote class="twitter-tweet twitter-custom-tweet" data-twitter-tweet-id="1318175677724676096" data-partner="rebelmouse"><div style="margin:1em 0">There's a lot of competition for Vilest Policy Ever, but slashing food stamps during a pandemic that's causing mass… https://t.co/EYvb0C8Q3m</div> — Tamar Haspel (@Tamar Haspel)<a href="https://twitter.com/TamarHaspel/statuses/1318175677724676096">1603112546.0</a></blockquote></div>
<div id="946d8" class="rm-shortcode" data-rm-shortcode-id="3cff2dc2643fc55ab21d2a73881c7de8"><blockquote class="twitter-tweet twitter-custom-tweet" data-twitter-tweet-id="1318168614541950976" data-partner="rebelmouse"><div style="margin:1em 0">Trump: yes to Space Force, no to Food Stamps. Another equation that might be remembered in a few weeks. https://t.co/9IEDBaMy2o</div> — Matt Taibbi (@Matt Taibbi)<a href="https://twitter.com/mtaibbi/statuses/1318168614541950976">1603110862.0</a></blockquote></div><p>"Trump: yes to Space Force, no to Food Stamps," Taibbi tweeted.</p>
- Trump Wants to Replace Food Stamps With Food Packages ... ›
- Trump Complains Puerto Rico Getting 'Too Much' Disaster Aid as ... ›
- Trump USDA Resumes Effort to Cut Food Stamp Benefits - EcoWatch ›
By Andrea Germanos
A group of Indigenous women and their allies on Monday urged the heads of major global financial institutions to stop propping up the tar sands industry and sever all ties with the sector's "climate-wrecking pipelines, as well as the massively destructive extraction projects that feed them."
- Global Banks, Led by JPMorgan Chase, Invested $1.9 Trillion in ... ›
- Keystone XL Pipeline Construction to Forge Ahead During ... ›
Poor eating habits, lack of exercise, genetics, and a bunch of other things are known to be behind excessive weight gain. But, did you know that how much sleep you get each night can also determine how much weight you gain or lose?
In January of 2019, a concerned citizen in Marion County, Florida noticed something strange: Someone was trapping flying squirrels.
The process of preparing and mixing a baby bottle formula seems innocuous, but new research finds this common occurrence is actually releasing millions of microplastic particles from the bottle's lining, Wired reported.
- Microplastics Found in Human Organs for First Time - EcoWatch ›
- Microplastics Are Raining Down on Cities - EcoWatch ›
- People Eat 50,000+ Microplastics Every Year, New Study Finds ... ›