Sulfur dioxide forms lung-damaging soot and smog, and has been linked to an array of respiratory problems.
According to the company it removes not just sulfur dioxide, but also carbon dioxide and nitrogen oxides.
Because they often burn high sulfur fuels, they produce about 50% of the global emissions of sulfur dioxide.
Ertel was soon a big producer at Natsource, trading sulfur dioxide, nitrogen oxide, carbon and even weather derivatives.
"The marble and sandstone were being weathered by atmospheric fumes, including sulfur dioxide and nitrogen oxides, " Gopalakrashne says.
It releases nearly 500 tons each of copper and nickel oxides and 2 million tons of sulfur dioxide into the air.
The Baldwin plant in Illinois is the worst offender for sulfur dioxide pollution.
CNN: Nature - America's most wanted: Power plants urged to clean up their act
He soon broke ranks with utility executives by supporting a cap-and-trade system for sulfur dioxide and other coal-plant pollutants.
The Indiana-based utility is investing in the required equipment to reduce its sulfur dioxide, nitrogen oxide and mercury pollution.
Technology has made it possible for power plants such as this to reduce conventional pollutants such as sulfur dioxide.
It also releases double the other pollutants regulated by the Clean Air Act that include sulfur dioxide and nitrogen oxide.
The process that smokestack "scrubbers" use to reduce nitrogen oxide and sulfur dioxide emissions creates high-quality synthetic gypsum, said Robert E.
According to EPA, the levels of sulfur dioxide and nitrogen oxide would have been cut in half under the cross-state rule.
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Ertel, who got his start trading natural gas and more-established pollution credits (such as for sulfur dioxide), isn't spooked by uncertainty.
Impurities are removed from the gas before it is burned, which results in lower emissions of sulfur dioxide, particulates and mercury.
Back then, the concern was sulfur dioxide, the culprit behind acid rain.
The latest industry blueprint from the Ministry of Industry and Information Technology, which took effect in October, cut maximum thresholds for sulfur dioxide emissions.
It also emits the most carbon dioxide and sulfur dioxide, making it the world's No. 1 contributor to global warming as well as acid rain.
The sulfur dioxide and soot thrown off results not only in a polluted atmosphere but also acid rain that falls on a third of China's cities.
So far the most toxic of pollutants from ships, like sulfur dioxide, have been the main focus of the IMO program and also other regional regulations.
Twenty million metric tons of sulfur dioxide mixed with droplets of water, creating a kind of gaseous mirror, which reflected solar rays back into the sky.
What is known is that 3.5 billion years ago, Crotts says, the moon regularly spewed forth large amounts of water vapor and sulfur dioxide through volcanic surface vents.
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Chastened, in 1995 Ertel joined the then-new pollution desk at Natsource, where he sold sulfur dioxide credits in a market created by tough U.S. regulations on coal-burning utilities.
Originally scheduled to go into effect on January 1st, the rule would have required 27 upwind states to dramatically reduce sulfur dioxide and nitrogen oxide emissions by 2014.
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This simple move, documented in a U.S. Department of Energy report will cut emissions of carbon dioxide, sulfur dioxide, nitrous oxide and other emissions significantly while reducing costs.
Chastened, in 1995 Ertel joined the then new pollution desk at Natsource, where he sold sulfur dioxide credits in a market created by tough U.S. regulations on coal-burning utilities.
In exchange, AEP changed the conditions of an earlier court settlement and will use equipment at the Rockport power plant in Indiana that will not reduce sulfur dioxide as much.
Thanks to mandated installation of emissions-reduction technology, since 1990 U.S. emissions of sulfur dioxide have dropped from more than 15 million tons per year to less than 4 million tons.
For energy, more than a billion tons of coal -- a quarter of the world's total output -- are burned every year, coating metropolitan areas with sulfur dioxide, soot and smoke.
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Sulfur dioxide produces fine particulate matter and acid rain.
CNN: Nature - America's most wanted: Power plants urged to clean up their act
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