Displaying items by tag: epa
Hydrofluorocarbons were used on an industrial scale to replace ozone layer-destroying chlorofluorocarbons used in refrigeration, cooling and other applications, but they turned out to be a powerful driver of climate change. Scientists estimate HFCs are 1,000 times more potent than carbon dioxide in terms of their cimate-change role.
Oak Ridge National Laboratory scientists continue research into zero-emission refrigerant technologies.
According to Times reporting: "In proposing a new regulation, Michael S. Regan, the E.P.A. administrator, said the agency aimed to reduce the production and importation of hydrofluorocarbons, which are used in refrigeration and air-conditioning, in the United States by 85 percent over the next 15 years."
The lack of regional and local vehicle traffic during the pandemic greatly reduced measurable pollution in Great Smoky Mountains National Park.
This is your Hellbender weekend read, and the first in an occasional Hellbender Press series about the effects of the Covid-19 pandemic on the natural world
Great Smoky Mountains National Park shut down for six weeks in 2020 during the Covid-19 pandemic. Recorded emissions reductions during that period in part illustrate the role motor vehicles play in the park's vexing air-quality issues. The full cascade of effects from the pollution reductions are still being studied.
Hellbender Press interviewed park air quality specialist Jim Renfro about the marked reduction of carbon dioxide and other pollutants documented during the park closure during the pandemic, and the special scientific opportunities it presents. He responded to the following questions via email.
Hellbender Press: You cited “several hundred tons" in pollutant reductions during an interview with WBIR of Knoxville (in 2020). What types of air pollutants does this figure include?
Answer: Carbon dioxide (CO2) would be most of the tons reduced from the lack of motor vehicles in the park during the park shutdown because of the pandemic. Carbon monoxide (CO), nitrogen oxides (NOx), volatile organic compounds (VOCs), and particulate matter are other emissions that were lower, but to a much lesser extent.
HP: During what time frame?
A: It was based on when the primary park roads were closed, for about a six-week period from March 24 through May 9 (2020)
HP: Was this based on data collected at the Look Rock air-quality monitoring station or monitoring sites throughout the park?
A: No, it was estimated reductions in air emissions (tons) from using the park's emissions inventory for criteria air pollutants and greenhouse gases coupled with the reduction in park visitation data for the period of the park shutdown.
HP: Was this a result of reduced auto travel in the park?
HP: A lot of emissions, of course, come from outside of the park. Was the improvement in air quality also a function of reduced pollutants coming from outside the park?
A: The documented reduction was with emissions, not air quality. Air quality analysis is still under way to look at changes in air pollutants.
HP: What do you think the primary reasons for the air quality improvements were?
A: If there were reductions in air pollutants (and that is still being analyzed by EPA and NPS Air Resources Division), it was due primarily to the reduction in motor vehicle emissions in and near the park (and regionally).
HP: Did you purposefully set out to quantify the pandemic’s effect on air quality, or was this an “accidental” discovery?
A: We did not purposefully set out to quantify the pandemic's effect on air quality. Monitoring efforts continued during the pandemic and provided a unique and unexpected opportunity to characterize the differences in air emissions (from park closures and limited motor vehicle emissions) and air pollutants (which will take longer to look at laboratory analysis after quality assured analysis).
- great smoky mountains national park
- air pollution
- air quality
- pollutant reduction
- carbon dioxide
- motor vehicle
- jim renfro
- look rock
- greenhouse gas
- traffic volume
- monitoring station
- particulate matter
- acid deposition
- quality control
- quality assurance
- so2 regional haze rule
- national park service
- air resource specialist
- road closure
- power plant
- environmental protection agency