ambient air standard

ambient air standard

the maximum tolerable concentration of any outdoor air pollutant as set by the Environmental Protection Agency (EPA) to protect public health and the environment. The EPA considers lead, the nitrogen oxides, particulate matter, sulfur dioxide, carbon monoxide, and ozone "criteria" pollutants. Research and medical evidence show a strong correlation between many diseases and toxic chemicals, but little is known about the precise effects and movement of airborne pollutants.
References in periodicals archive ?
Previously, the ambient air standard for polychlorinated biphenyls--the measurement of acceptable air quality--was 5 nanograms per cubic meter during a 24-hour period.
When scientists are trying to assess whether volatile pollutant levels in soil are safe, the levels are compared against the ambient air standard.
As such, the pollutants should be listed by EPA as criteria pollutants, and ambient air standards should be issued for them, the complaint said.
First, Ottinger refers to various ambient air standards and the fact that there is "no consensus on what constitute [s] a safe or permissible level.
Ironically, about 127 million Americans still live in counties where air pollution levels exceed one or more of the six National Ambient Air Standards (NAAQS), and politicians still debate whether the health-based regulation of air quality is hurting the economy and stymieing job growth despite evidence to the contrary.
The company also monitors in parts per million, while more protective provisions set for ambient air standards in Louisiana are in parts per billion.
Ambient air standards govern the amount of dangerous pollutants that are allowed in the air people breathe.
The United States Environmental Protection Agency (US EPA) sets national minimum criteria that govern states' clean air problems, including their ambient air standards, the extent of states' monitoring and enforcement programs, the financial and legal resources granted to state clean air agencies, and so on.
In political terms, cleaner ambient air standards are particularly important to regions like Southern California.
The state's implementation plan, or the CO SIP in EPA jargon, must demonstrate that all areas in the state can achieve national ambient air standards for carbon monoxide by 1996.
Hardest hit will be those who are currently not in compliance with ambient air standards for ozone levels.
These emissions could impact population centers in the Northeast that already fail to meet ambient air standards.