Expect more unhealthy ozone days

2016-04-21 17:59


Multimedia   ·   User Galleries   ·   News in Pictures Send us your pictures  ·  Send us your stories

Miami - A warming planet means more hot days than before, and the phenomenon could cause three to nine more days per year when ozone levels are unhealthy by the 2050s, scientists warned on Thursday.

Automobile exhaust spews nitrogen dioxide and causes a build-up of unhealthy ground level ozone in the atmosphere. The problem tends to get worse when the temperature rises and the air stagnates.

The dangers of ozone pollution can include lung damage in adults and asthma in small children.

"In the coming decades, global climate change will likely cause more heat waves during the summer, which in turn could cause a 70 to 100% increase in ozone episodes, depending on the region," said Lu Shen, a graduate student at the Harvard John A Paulson School of Engineering and Applied Sciences and lead author of the study in Geophysical Research Letters.

California, the southwestern United States and the northeast region could see up to nine more days of dangerous ozone levels than present, the study found.

Much of the rest of the United States will likely experience an increase of 2.3 days, according to the model devised by researchers, based on observed relationships between temperature and ozone to predict future episodes.

"Typically, when the temperature increases, so does surface ozone," said co-author Loretta Mickley.

"Ozone production accelerates at high temperatures, and emissions of the natural components of ozone increase. High temperatures are also accompanied by weak winds, causing the atmosphere to stagnate. So the air just cooks and ozone levels can build up."

High ozone spells danger for people who have chronic lung disease. They are often warned to stay inside on unhealthy ozone days.

Unhealthy ozone levels range from 100 to 500 parts per billion, according to the US Environmental Protection Agency.

Ways to reduce ozone pollution include driving less and cutting down on electricity use, the EPA says.

"This research gives us a much better understanding of how ozone and temperature are related and how that will affect future air quality," said Mickley.

"These results show that we need ambitious emissions controls to offset the potential of more than a week of additional days with unhealthy ozone levels."

Read more on:    us  |  climate change

Join the conversation!

24.com encourages commentary submitted via MyNews24. Contributions of 200 words or more will be considered for publication.

We reserve editorial discretion to decide what will be published.
Read our comments policy for guidelines on contributions.

Inside News24

Traffic Alerts
There are new stories on the homepage. Click here to see them.


Create Profile

Creating your profile will enable you to submit photos and stories to get published on News24.

Please provide a username for your profile page:

This username must be unique, cannot be edited and will be used in the URL to your profile page across the entire 24.com network.


Location Settings

News24 allows you to edit the display of certain components based on a location. If you wish to personalise the page based on your preferences, please select a location for each component and click "Submit" in order for the changes to take affect.

Facebook Sign-In

Hi News addict,

Join the News24 Community to be involved in breaking the news.

Log in with Facebook to comment and personalise news, weather and listings.