Sentences with phrase «ozone concentrations drop»
Scientists use the word hole as a metaphor for the area in which ozone concentrations drop below the historical threshold of 220 Dobson Units.
https://earthobservatory.nasa.gov/ Not exact matches
The ozone hole is the region where concentrations drop below 220 DU.
The progress we've made is undeniable - national average peak ozone concentrations have dropped by 17 percent since 2000.
A drop in the concentration of ozone in the lower stratosphere should also produce a net cooling at the surface.
«Thanks in part to the increased use of domestic natural gas, ozone concentrations in the air have dropped by 17 percent since 2000, all of which makes the United States not just an energy superpower, but also a leader in reducing global emissions.