What is Bad Ozone?

Sometimes we hear that ozone is good, as in the ozone layer, and sometimes we hear that ozone is bad as in air pollution or smog.  How can it be both good and bad?  This depends on where it is in the environment and how it is formed.  


This page will discuss the so called "bad ozone" or "ground level ozone".  To learn about "good ozone" by clicking on this link.  


In the Earth’s lower atmosphere, near ground level, ozone is formed when pollutants emitted by cars, power plants, chemical plants, and other sources react chemically in the presence of sunlight. 


Ozone pollution is a concern during the summer months when the weather conditions needed to form ground-level ozone—lots of sun, hot temperatures—normally occur.

Ozone can irritate your respiratory system, causing you to start coughing, feel an irritation in your throat and/or experience an uncomfortable sensation in your chest. Ozone can reduce lung function and make it more difficult for you to breathe as deeply and vigorously as you normally would. 


When this happens, you may notice that breathing starts to feel uncomfortable. If you are exercising or working outdoors, you may notice that you are taking more rapid and shallow breaths than normal. 


Ozone can aggravate asthma. When ozone levels are high, more people with asthma have attacks that require a doctor’s attention or the use of additional medication. One reason this happens is that ozone makes people more sensitive to allergens, which are the most common triggers for asthma attacks. Also, asthmatics are more severely affected by the reduced lung function and irritation that ozone causes in the respiratory system. 


Ozone can inflame and damage cells that line your lungs. Within a few days, the damaged cells are replaced and the old cells are shed—much in the way your skin peels after a sunburn. 


Ozone may aggravate chronic lung diseases such as emphysema and bronchitis and reduce the immune system’s ability to fight off bacterial infections in the respiratory system.

This is why ozone water treatment systems are designed to remove ozone before the vent gas is released into the environment.

Here are some additional links on ground level ozone:

Ozone and Your Health (USEPA)
Smog - Who Does it Hurt? (USEPA)
Summertime Safety: Keeping Kids Safe from Sun and Smog (USEPA)USEPA Ozone Air Quality StandardsUS Ozone Air Quality Trends


gotquestions http://www.spartanwatertreatment.com/ground-level-ozone.html

3.7M in U.S. at flood risk due to warming

(AP) WASHINGTON - Global warming-fueled sea level rise over the next century could flood 3.7 million people in 544 U.S. cities temporarily, according to a new method of looking at risking of rising seas published in two scientific papers.

The cities that have the most people living within three feet of high tide — the projected sea level rise by the year 2100 made by many scientists and computer models — are in Florida, Louisiana, and New York. New York City, often not thought of as a city prone to flooding, has 141,000 people at risk, which is second only to New Orleans' 284,000. The two big Southeast Florida counties, Miami-Dade and Broward, have 312,000 people at risk combined.

"Southeast Florida is definitely the highest density of population that's really on low coastal land that's really most at risk," said lead author Ben Strauss, a scientist at Climate Central. Climate Central is a New Jersey-based group of scientists and journalists who do research about climate change.

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The studies look at people who live in homes within three feet of high tide, whereas old studies looked just at elevation above sea level, according to work published Thursday in the peer-reviewed journal Environmental Research and an accompanying report by Climate Central. That's an important distinction because using high tide is more accurate for flooding impacts, said study co-author Jonathan Overpeck, a scientist at the University of Arizona's Institute of the Environment. And when the new way of looking at risk is factored in, the outlook looks worse, Overpeck said.

"It's shocking to see how large the impacts could be, particularly in southern Florida and Louisiana, but much of the coastal U.S. will share in the serious pain," Overpeck said.

Sea level has already risen about 8 inches since 1880 because of warmer waters expand, Strauss said.

Sea level rise experts at the U.S. Geological Survey and the National Oceanic Atmospheric Administration who weren't part of the studies said the results make sense and were done by experts in the field.

"All low elevation places in the many urban areas along the coast will become more vulnerable, like Boston, New York City, Norfolk (Va.), New Orleans, Charleston (S.C.), Miami, Washington, D.C./Alexandria (Va.)," said S. Jeffress Williams, scientist emeritus for the USGS, who wasn't part of the studies. "More people and infrastructure will be at increasing risk of flooding."

http://www.cbsnews.com/8301-205_162-57397000/study-3.7m-in-u.s-at-flood-risk-due-to-warming/