Ozone in a sentence

For the first time, scientists have shown through direct satellite observations of the ozone hole that levels of ozone-destroying chlorine are declining, resulting in less ozone depletion.

Ozone cycle overview Three forms (or allotropes ) of oxygen are involved in the ozone-oxygen cycle : oxygen atoms (O or atomic oxygen), oxygen gas ( Omain or diatomic oxygen), and ozone gas ( Omain or triatomic oxygen).

Ozone hole and its causes Ozone hole in North America during 1984 (abnormally warm reducing ozone depletion) and 1997 (abnormally cold resulting in increased seasonal depletion).

The ozone case was understood comparably well by lay persons as e.g. Ozone shield or ozone hole were useful "easy-to-understand bridging metaphors".

The ozone layer contains less than 10 parts per million of ozone, while the average ozone concentration in Earth's atmosphere as a whole is about 0.3 parts per million.

An update from the Scientific Assessment Panel to the Montreal Protocol confirms that the ozone layer is recovering, and ozone levels are expected to return to 1980 levels by around 2066 over the Antarctic.

Ground-level ozone projections are high for the holiday weekend, as a combination of sun, low humidity and warm temperatures is hospitable for the chemical reactions that turn pollutants into ozone.

The number of days ozone levels have reached 71 ppb or higher has steadily declined since 2003, when the county recorded 62 days with ozone concentrations above that limit, MacDonald said.

Children, people who are sensitive to ozone, and people with heart or lung disease should limit prolonged outdoor exertion during the late afternoon or early evening when ozone concentrations are highest.

Near-ground ozone can lead to coughing, irritation of the throat and chest, exacerbation of asthma, inflammation of lung cells, aggravation of chronic lung diseases, and ozone even reduces the disease-fighting capabilities of the immune system.

Ozone is regulated as a pollutant by the EPA because of ozone's hazardous nature.

Q: "When I was younger, in the 90s, in the early 2000s I would hear a lot about the ozone layer and ozone depletion, but I never hear about it now.

She cautioned that suppression doesn't mean that ozone levels are reversing in high heat or that extreme heat protects us from ozone.

Since 1989, when the Montreal Protocol against the production of chemicals causing ozone depletion came into effect, it's been hard to relate changes in the size of the ozone hole to human activity.

All of the ozone depleting substances controlled by the Montreal Protocol contain either chlorine or bromine (substances containing only fluorine do not harm the ozone layer).

Although decreases in stratospheric ozone are well-tied to CFCs and to increases in surface UVB, there is no direct observational evidence linking ozone depletion to higher incidence of skin cancer and eye damage in human beings.

By 2009, nitrous oxide was the largest ozone-depleting substance (ODS) emitted through human activities. citation Levels of atmospheric ozone measured by satellite show clear seasonal variations and appear to verify their decline over time.

Chemicals in the atmosphere CFCs and related compounds in the atmosphere Chlorofluorocarbons (CFCs) and other halogenated ozone depleting substances (ODS) are mainly responsible for man-made chemical ozone depletion.

ClO is produced by the reaction of Cl with ozone—its observation thus demonstrated that Cl radicals not only were present in the stratosphere but also were actually involved in destroying ozone.

Further refinement of that model accounted for 89 percent of the ozone destroyed, but pushed back the estimated recovery of the ozone hole from 75 years to 150 years.