Earth’s ‘ozone hole’ shrinks to lowest since 1988

From NASA Goddard: Warm Air Helped Make 2017 Ozone Hole Smallest Since 1988 Measurements from satellites this year showed the hole in Earth’s ozone layer that forms over Antarctica each September was the smallest observed since 1988, scientists from NASA and NOAA announced Friday. According to NASA, the ozone hole reached its peak extent on…

Ozone treaty taking a bite out of US greenhouse gas emissions

Public Release: 14-Aug-2017 American Geophysical Union From Eurekalert WASHINGTON D.C. — The Montreal Protocol, the international treaty adopted to restore Earth’s protective ozone layer in 1989, has significantly reduced emissions of ozone-depleting chemicals from the United States. In a twist, a new study shows the 30-year old treaty has had a major side benefit of…

Study: trees in cities actually make pollution worse during heat waves

From the AMERICAN CHEMICAL SOCIETY comes this counter-intuitive finding: During heat waves, urban trees can increase ground-level ozone Planting trees is a popular strategy to help make cities “greener,” both literally and figuratively. But scientists have found a counterintuitive effect of urban vegetation: During heat waves, it can increase air pollution levels and the formation…