Navigation Links
Ethanol vehicles pose a significant risk to human health, study finds

Ethanol is widely touted as an eco-friendly, clean-burning fuel. But if every vehicle in the United States ran on fuel made primarily from ethanol instead of pure gasoline, the number of respiratory-related deaths and hospitalizations would likely increase, according to a new study by Stanford University atmospheric scientist Mark Z. Jacobson. His findings are published in the April 18 online edition of the journal Environmental Science & Technology (ES&T).

''Ethanol is being promoted as a clean and renewable fuel that will reduce global warming and air pollution,'' said Jacobson, associate professor of civil and environmental engineering. ''But our results show that a high blend of ethanol poses an equal or greater risk to public health than gasoline, which already causes significant health damage.''

Gasoline vs. ethanol

For the study, Jacobson used a sophisticated computer model to simulate air quality in the year 2020, when ethanol-fueled vehicles are expected to be widely available in the United States.

''The chemicals that come out of a tailpipe are affected by a variety of factors, including chemical reactions, temperatures, sunlight, clouds, wind and precipitation,'' he explained. ''In addition, overall health effects depend on exposure to these airborne chemicals, which varies from region to region. Ours is the first ethanol study that takes into account population distribution and the complex environmental interactions.''

In the experiment, Jacobson ran a series of computer tests simulating atmospheric conditions throughout the United States in 2020, with a special focus on Los Angeles. ''Since Los Angeles has historically been the most polluted airshed in the U.S., the testbed for nearly all U.S. air pollution regulation and home to about 6 percent of the U.S. population, it is also ideal for a more detailed study,'' he wrote.

Jacobson programmed the computer to run air quality simul ations comparing two future scenarios:

  • A vehicle fleet (that is, all cars, trucks, motorcycles, etc., in the United States) fueled by gasoline, versus
  • A fleet powered by E85, a popular blend of 85 percent ethanol and 15 percent gasoline.

Deaths and hospitalizations

The results of the computer simulations were striking.

''We found that E85 vehicles reduce atmospheric levels of two carcinogens, benzene and butadiene, but increase two others-formaldehyde and acetaldehyde,'' Jacobson said. ''As a result, cancer rates for E85 are likely to be similar to those for gasoline. However, in some parts of the country, E85 significantly increased ozone, a prime ingredient of smog.''

Inhaling ozone-even at low levels-can decrease lung capacity, inflame lung tissue, worsen asthma and impair the body's immune system, according to the Environmental Protection Agency. The World Health Organization estimates that 800,000 people die each year from ozone and other chemicals in smog.

''In our study, E85 increased ozone-related mortalities in the United States by about 200 deaths per year compared to gasoline, with about 120 of those deaths occurring in Los Angeles,'' Jacobson said. ''These mortality rates represent an increase of about 4 percent in the U.S. and 9 percent in Los Angeles above the projected ozone-related death rates for gasoline-fueled vehicles in 2020.''

The study showed that ozone increases in Los Angeles and the northeastern United States will be partially offset by decreases in the southeast. ''However, we found that nationwide, E85 is likely to increase the annual number of asthma-related emergency room visits by 770 and the number of respiratory-related hospitalizations by 990,'' Jacobson said. ''Los Angeles can expect 650 more hospitalizations in 2020, along with 1,200 additional asthma-related emergency visits.''

The deleterious health effects of E85 will be the same, whether the ethanol is made from corn, switchgrass or other plant products, Jacobson noted. ''Today, there is a lot of investment in ethanol,'' he said. ''But we found that using E85 will cause at least as much health damage as gasoline, which already causes about 10,000 U.S. premature deaths annually from ozone and particulate matter. The question is, if we're not getting any health benefits, then why continue to promote ethanol and other biofuels?

''There are alternatives, such as battery-electric, plug-in-hybrid and hydrogen-fuel cell vehicles, whose energy can be derived from wind or solar power,'' he added. ''These vehicles produce virtually no toxic emissions or greenhouse gases and cause very little disruption to the land-unlike ethanol made from corn or switchgrass, which will require millions of acres of farmland to mass-produce. It would seem prudent, therefore, to address climate, health and energy with technologies that have known benefits. ''


Source:Stanford University

Related biology news :

1. Ethanol and biodiesel from crops not worth the energy
2. Scientists force viruses to evolve as better delivery vehicles for gene therapy
3. Squid-inspired design could mean better handling of underwater vehicles
4. Mitochondrial DNA mutations play significant role in prostate cancer
5. A slight difference and significant similarities
6. Sleeping beauty plays a significant role in identifying cancer genes
7. Progress on HIV/AIDS significant but insufficient
8. Delaware scientists make significant advance in study of small RNAs
9. Study suggests that publicly available genome data may contain small but significant errors
10. Biofuels can replace about 30 percent of fuel needs with significant research and policy effort
11. COX-2 inhibitors significantly reduce risk of cancer
Post Your Comments:

(Date:11/2/2015)...  SRI International has been awarded a contract of ... to the National Cancer Institute (NCI) PREVENT Cancer Program ... modern testing and support facilities, and analytical instrumentation to ... studies to evaluate potential cancer prevention drugs. ... Drug Development Program is an NCI-supported pipeline to bring ...
(Date:10/29/2015)... 29, 2015  Rubicon Genomics, Inc., today announced ... of its DNA library preparation products, including the ... ThruPLEX Plasma-seq kit. ThruPLEX Plasma-seq has been optimized ... NGS libraries for liquid biopsies--the analysis of cell-free ... applications in cancer and other conditions. Eurofins Scientific ...
(Date:10/27/2015)... NEW YORK , Oct. 27, 2015 ... the major issues of concern for various industry verticals ... This is due to the growing demand for secure ... practices in various ,sectors, such as hacking of bank ... concerns for electronic equipment such as PC,s, laptops, and ...
Breaking Biology News(10 mins):
(Date:11/30/2015)... Zenith Epigenetics Corp. ("Zenith" or the "Company") today announced that ... its Board of Directors to replace Dr. Peter Johann ... experience as co-founder of Resverlogix, with expertise in the fields ... --> Dr. Wong remarked, "I am very excited ... standing expertise in epigenetics and the advanced stage of the ...
(Date:11/30/2015)... , November 30, 2015 TapImmune, ... the development of innovative peptide and gene-based immunotherapeutics and ... today announced it will be presenting at the 8 ... 1, 2015 at 2.30 PM PT. Dr. John ... Advisor will be giving the presentation and will join ...
(Date:11/30/2015)... BETHESDA, Md. , Nov. 30, 2015  Northwest ... biotechnology company developing DCVax® personalized immune therapies for solid ... to adding an additional independent director, and the Company ... investigation of allegations in a recent anonymous internet report ... on both initiatives. Linda Powers stated, ...
(Date:11/27/2015)... ... November 27, 2015 , ... ... includes over 2,000 technical presentations offered in symposia, oral sessions, workshops, awards, and ... covers a wide range of applications such as, but not limited to, biotechnology, ...
Breaking Biology Technology: