Green Car Congress
JULY 29, 2020
Large improvements of air quality in China during the lockdown have been widely reported, but new research shows that two pollutants harmful to human health—fine particulate matter (PM 2.5 ) and ozone—were only slightly reduced. and ozone were only slightly reduced or barely affected.
Green Car Congress
NOVEMBER 3, 2015
Some of the substitutes for ozone-damaging chemicals that being phased out worldwide under international agreements are themselves potent greenhouse gases and contribute to warming. This work was supported in part by NOAA’s Atmospheric Chemistry, Carbon Cycle, and Climate (AC4) Program and NASA’s Atmospheric Composition Program.
Green Car Congress
MAY 1, 2018
NO x emissions have not been decreasing as expected in recent years (2011–2015) when comparing top-down estimates from satellites and surface NO 2 measurements to the trends predicted from the US Environmental Protection Agency’s emission inventory data, according to a new study by an international team of researchers. Click to enlarge.
Green Car Congress
AUGUST 5, 2019
NO x was reduced by 96% and carbon dioxide by 13% with a propane bus. These findings are significant due to the fact that NO x and ozone are major non-attainment concerns for many areas across the nation. For the stop-and-go route, NO x emissions were 34 times higher for the diesel school bus. —Ross Ryskamp, Ph.D.,
Green Car Congress
JANUARY 23, 2020
HFC-23 is a very potent greenhouse gas, with one tonne of its emissions being equivalent to the release of more than 12,000 tonnes of carbon dioxide. Starting in 2015, India and China, thought to be the main emitters of HFC-23, announced ambitious plans to abate emissions in factories that produce the gas.
Green Car Congress
SEPTEMBER 27, 2015
The study found that 60% of the winter primary hydrocarbon hydroxyl radical reactivity in London is from those diesel-related hydrocarbons; the authors predicted that the longer-chain HCs contribute up to 50 % of the ozone production potential in London. —Dunmore et al. Dunmore et al. Dunmore et al.
Green Car Congress
MAY 8, 2015
Short-lived climate pollutants (SLCPs) include methane, tropospheric ozone, black carbon, and fluorinated gases. They are powerful climate forcers that remain in the atmosphere for a much shorter period of time than carbon dioxide.
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