The phrase "ambient standard" is correct and usable in written English.
It can be used in contexts related to environmental science, regulations, or quality benchmarks that pertain to ambient conditions.
Example: "The ambient standard for air quality must be adhered to in order to ensure public health and safety."
Alternatives: "environmental standard" or "background standard".
The U.S. EPA revised its regulations to include an annual ambient standard for PM2.5 (A8), conducting multiple stages of staff and public review of the new standard from the mid-1990s through 2006 (e.g., U.S. EPA 2004).
Equal treatment of all particles that contribute to mass, irrespective of composition, may be leading to less-optimal control strategies to avoid the adverse human health effects of PM, potentially causing the present PM ambient standard to be less protective of health in some areas of the nation than in others.
The standards imposed on actual discharges generally come in two forms: (1) environmental-quality, or ambient, standards, which fix the maximum amount of the regulated pollutant or pollutants tolerated in the receiving body of air or water, and (2) emission, or discharge, standards, which regulate the amount of the pollutant or pollutants that any "source" may discharge into the environment.
The alternative to market mechanisms is the more traditional command and control approach which includes ambient standards, source-specific emission limits, or technology requirements.
A review of the basis for current ambient standards is given.
The senate report states that the CAA will address "particularly sensitive citizens such as bronchial asthmatics and emphysematics," through the development of "ambient standards necessary to protect... sensitive group[s] rather than a single person in such a group".
In the European Union, ambient standards for NO2 have recently been tightened, and along with the World Health Organization (WHO), guidelines of a 40 μg/m3 annual average and a 200 μg/m3 1-hour maximum [ 3] were established.
We should also note that an application of such time-series epidemiological analyses is often to help set ambient standards that will ultimately be monitored at a central site, and from a regulatory perspective, the central site ambient pollution levels are most relevant.
States are required to submit implementation plans to achieve compliance with the new ambient standards; as part of these plans, state and local governments pass rules and regulations requiring industry and consumers to change their operations (C6) and reduce emissions (C7).
The current EPA ambient air standard for PM2.5 is 35 micrograms per cubic meter of air averaged over 24 hours.
Daily PM10 values at some locations met and approached the US 24-h ambient PM10 standard value of 150 μg m−3.
