What is O zone and where is it in the atmosphere?

Ozone location. Most ozone resides in the lower stratosphere in what is commonly known as the “ozone layer.” The remaining ozone, about 10%, is found in the troposphere, which is the lowest region of the atmosphere, between Earth’s sur- face and the stratosphere.

Is O3 ozone harmful?

Whether in its pure form or mixed with other chemicals, ozone can be harmful to health. When inhaled, ozone can damage the lungs. Relatively low amounts of ozone can cause chest pain, coughing, shortness of breath and, throat irritation.

In what region in atmosphere that O3+ and O are available?

Ozone location. Most ozone (about 90%) is found in the stratosphere, which begins about 10–16 kilometers (6–10 miles) above Earth’s surface and extends up to about 50 kilo- meters (31 miles) altitude. The stratospheric region with the highest ozone concentration is commonly known as the “ozone layer” (see Figure Q1-2).

Where is O3 found?

Ozone (O3) is mainly found in two layers of our atmosphere: the troposphere and the stratosphere. The stratosphere, 10 and 50 kilometers above the Earth’s surface, contains around 90% of the total atmospheric ozone amount.

Which layer of atmosphere has Ozone O3 gas concentration?

Most atmospheric ozone is concentrated in a layer in the stratosphere, about 9 to 18 miles (15 to 30 km) above the Earth’s surface (see the figure below). Ozone is a molecule that contains three oxygen atoms. At any given time, ozone molecules are constantly formed and destroyed in the stratosphere.

What is a safe level of O3?

The NIOSH recommended exposure limit for ozone is 0.1 ppm (0.2 mg/m). According to NIOSH, Ozone levels of 5 ppm or higher are considered immediately dangerous to life or health.

Why is O3 a problem?

Ozone can aggravate asthma, and can inflame and damage cells that line your lungs. Ozone may also 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. Lastly, ozone may cause permanent lung damage.

Can humans breathe O3?

When we breathe air unpolluted by human activities, we usually take in about 10 to 15 parts of ozone per billion parts of air (10-15 ppb). However, pollution from human activities has elevated levels of the ozone we breathe.

How much ozone is safe breathing?

Ozone-Generating Devices The EPA’s national standards for ozone (which fall under National Ambient Air Quality Standards per the Clean Air Act) is an indoor ozone concentration of 0.070 ppm for 8 hours over an annual period. Recommendations from NIOSH suggest that 0.10 ppm should never be exceeded.