The air quality in some national parks isn't any better than in major cities
July 25, 2018, 9:23 a.m. by Matt Hickman
Sequoia National Park has more smoggy days than L.A.
Ozone hole nears record-breaking size again
November 12, 2015, 10:56 a.m. by Elizabeth Newbern, LiveScience
The hole over Antarctica has actually been shrinking over the past few years.
2011 Japan tsunami unleashed ozone-destroying chemicals
April 6, 2015, 12:33 p.m. by Becky Oskin, LiveScience
Countries rarely account for greenhouse gases released into the atmosphere due to natural disasters when calculating their annual emissions.
Earth's protective ozone layer shows signs of recovery
September 11, 2014, 11:17 a.m. by Laura Geggel, LiveScience
International action that phased out the production and use of ozone-depleting chemicals is credited with helping the recovery.
'Everlasting storm' has 1 million lightning strikes a year
July 23, 2014, 3:42 p.m. by Russell McLendon
The Catatumbo Lightning has helped sailors, thwarted invasions and wowed onlookers for thousands of years.
Arctic's ozone hole is looking good
April 14, 2014, 3:51 p.m. by Becky Oskin, LiveScience
Along with a reduction in chemicals that destroy the ozone, the Arctic's unique environment aided in its recovery.
New ozone-destroying chemicals discovered in atmosphere
March 10, 2014, 9:30 a.m. by Laura Poppick, LiveScience
Loopholes in the Montreal Protocol may need to be tightened, researchers say.
What is PFTBA? Greenhouse gas is 7,000 times as potent as CO2
December 13, 2013, 9:44 a.m. by Denise Chow, LiveScience
There are no known ways to destroy or remove the long-lasting PFTBA from the atmosphere.
Ozone hole won't heal until 2070, says NASA
December 12, 2013, 11:10 a.m. by Tia Ghose, LiveScience
Efforts like the phasing out of CFCs appears to be working, but the impact won't be noticeable in the ozone layer for years to come, researchers say.