The Good and Bad of Ozone

Source: science.howstuffworks.com

It seems we have a love hate relationship with ozone. We are either putting a dangerous hole in it, or creating too much of it and harming the planet. So, what’s the deal with ozone?

Ozone is actually a molecule of three oxygen atoms bound together (O3). Even at low concentrations, it’s toxic, unstable, and highly reactive. It is found naturally in small concentrations in the stratosphere because ultraviolet light from the sun splits oxygen molecules (O2), forming two single oxygen atoms. When a freed atom collides with another oxygen molecule, it becomes ozone. Stratospheric ozone is called “good” ozone because it protects the Earth’s surface from dangerous ultraviolet light.

Ozone can also be found in the troposphere, the lowest layer of the atmosphere. Tropospheric ozone (“bad” ozone) is man-made, a result of air pollution from internal combustion engines and power plants. High levels of ozone are usually formed from emissions in the heat of the afternoon and early evening, dissipating during the cooler nights.

When you inhale ozone, it damages the bronchioles and alveoli in your lungs because it is very corrosive. In addition to effects on humans, the corrosive nature of ozone can damage plants and trees, destroying agricultural crops and forest vegetation. However, ozone can also be used as bleach, a deodorizing agent, and a sterilization agent for air and drinking water.

There are several ways you can help to decrease ozone pollution:

Limit using your automobile during afternoon and early evening hours in the late spring, summer and early fall.
Do not use gasoline-powered lawn equipment during these times.
Do not fuel your car during these times.
Do not light fires or outdoor grills during these times.
Keep the engine of your car or boat tuned.
Make sure that your tires are properly inflated.
Use environmentally safe paints, cleaning and office products (some of these chemicals are sources of VOC).
Conserve energy.

Besides personal attempts to reduce ozone pollution, the EPA has initiated more stringent air-quality standards (such as the Clean Air Act and its modifications) to reduce air pollution. Compliance with these standards by industries, manufacturers and state and local governments has significantly reduced the levels of many common air pollutants. By doing your part, you can reduce emissions even further and make a difference for a greener tomorrow.

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The Good and Bad of Ozone