Sentences with phrase «limited sulfur dioxide»

Concentrations of sulfate aerosols were especially high during these years before regulations like the Clean Air Act limited sulfur dioxide emissions that produce sulfate aerosols.

Similar systems have already helped phase out lead from motor fuel, and have limited sulfur dioxide emissions, which cause acid rain.

The study authors suggest that efforts to limit sulfur dioxide — a key precursor of sulfuric acid, one of the acids that scrubs ammonia from the atmosphere — could be partially responsible.

For the past ten years the plant has been operating without the level of emissions controls to limit sulfur dioxide and nitrogen oxide emissions as stipulated in the Clean Air Act.

Not exact matches

While U.S. power plants have limits on other air - born pollutants — like nitrogen and sulfur oxides that cause acid rain — there haven't been limits, until now, on the levels of carbon dioxide emissions that power plants can emit.

Of course, the plant that was closed in Tongliang lacked basic pollution control equipment to limit the emission of pollutants like carbon dioxide, sulfur dioxide, nitrogen oxide and particulate matter.

For more than two decades, power companies and grid operators have met pollution control limits for sulfur dioxide and other pollutants by ramping up cleaner generation and ramping down dirty generation, using both smokestack pollution controls and pollution reduction credits.

Over months of contentious debate, while the Waxman - Markey bill and subsequent Senate action were being considered, millions of Americans were introduced for the first time to the phrase «cap and trade,» a regulatory approach that first came to prominence in the 1990s as the centerpiece of a national program to address the threat of acid rain by limiting emissions of sulfur dioxide (SO2), primarily from electric power plants.

Requires the Administrator of the Environmental Protection Agency to: (1) promulgate performance standards (limiting emissions of sulfur dioxide, nitrogen oxides, particulate matter, and mercury) for new boilers, integrated gasification combined cycle plants, and combustion turbines; and (2) conduct a comprehensive research and environmental assessment program to enhance understanding of health and environmental effects of particulate matter and mercury and to demonstrate the efficacy of emission reductions under this Act.

Backed by 20 countries — and predictably, opposed by countries that still rely heavily on coal (Figure 1)-- the BREF includes new emission limits, expressed as wide, ambiguous ranges, for sulfur dioxides (SOx), nitrogen oxides (NOx), mercury, and particulate matter.

While the EPA has, under the Clean Air Act put federal limits on toxic emissions of arsenic, mercury, and lead pollution that power plants emit — as well as on pollutants like sulfur dioxide and nitrogen oxides — there are currently no such limits on the carbon emissions from new or existing power plants.

For example, in 1990, Congress amended the Clean Air Act to limit emissions of sulfur dioxide and nitrogen oxides, which are major sources of fine particulates.

Almost a quarter of the nation's coal - fired power plants lack controls limiting emissions of dangerous sulfur dioxide.

The plants are 100 years old, emit mercury, soot, and sulfur dioxide, among other toxic pollutants, and are exempt from some Clean Air Act limits.

In this model, a limited number of licenses to emit a specified pollutant, like sulfur dioxide, are issued.

The proposed limits for sulfur dioxide (SO2) and nitrogen oxides (NOx) do not meet the level of stringency required by the Clean Air Act.