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Ambient Air
Any unconfined portion of the atmosphere; open air, surrounding air.
Source: Terms of the Environment ...

Ambient Air
Outdoor air; all air that plants and animals breathe except the air inside buildings.
Atmosphere ...

Ambient Air - Open air, surrounding air, or outside air.
ASHRAE - American Society of Heating, Refrigerating and Air-Conditioning.
ASHRAE 55-1992 -ASHRAE standard: Thermal Environmental Conditions for Human Occupancy.

Ambient Air Quality Objectives or Standards
Air quality levels for specific pollutants that are determined to be necessary to protect human health and/or the environment.

~
Refers to the surrounding air. Generally, ~ refers to air outside and surrounding an air pollution source location. Often used interchangeably with "outdoor air."
Applicable or Relevant and Appropriate Requirements (ARARs) ...

~ Quality Standards (AAQS): Health- and welfare-based standards for outdoor air which identify the maximum acceptable average concentrations of air pollutants during a specified period of time.

~: Any unconfined portion of the atmosphere: open air, surrounding air.
~ Quality Standards: See Criteria Pollutants and National ~ Quality Standards.

~ quality standards See Criteria Pollutants and National ~ Quality Standards.
ambient temperature Temperature of the surrounding air (or other medium). For example, temperature of the room where a gas chlorinator is installed.

In ~, boron concentrations range from less than 0.5 to approximately 80 ng/m3 of air, with an average for air laying over continental land masses of 20 ng/m3 of air.

A ~
Definition (english only)
The air occurring at a particular time and place outside of structures. Often used interchangeably with 'outdoor air'.

~ quality criteria (AAQC)
For many pollutants, Ontario has established ~ quality criteria (AAQCs). They are set at the level where no adverse effect is observed on people or the environment.

National ~ quality standards Federal standards for the minimum ~ quality needed to protect public health and welfare.
Nitrogen oxides All oxides of nitrogen except nitrous oxide.

National ~ Quality Standards (NAAQS): Standards established by EPA that apply for outdoor air throughout the country. (See: criteria pollutants, state implementation plans, emissions trading.) ...

~ Any unconfined portion of the atmosphere; the outside air. anadromous Migratory fish that ascend rivers from the sea to spawn, like salmon. aquifer An underground bed or layer of earth, gravel or porous stone that contains water.

NAAQS - National ~ Quality Standards

NRC - National Recycling Coalition ...

Air Toxics Any air pollutant for which a National ~ Quality Standard (NAAQS) does not exist that may reasonably be anticipated to cause serious or irreversible chronic or acute health effects in humans.

~ usually means outdoor air (as opposed to indoor air). Analyte A chemical for which a sample (such as water, air, blood, urine or other substance) is tested. For example, if the analyte is mercury, the laboratory test will determine the amount of mercury in the sample.

National ~ Quality Standards or NAAQS
National Contingency Plan or NCP
National Environmental Policy or NEPA
National Estuary Program
National Footprint Accounts
National Green Building Standard
National Institute for Occupational Safety and Health or NIOSH ...

Carbon Dioxide (CO2): CO2 is a colorless, odorless, non-poisonous gas that is a normal part of the ~. Of the six greenhouse gases normally targeted, CO2 contributes the most to human-induced global warming.

Carbon dioxide (CO2) A naturally occurring colourless, odourless, non-poisonous gas which is a normal part of the ~.

Criteria Pollutants- The 1970 amendments to the Clean Air Act required EPA to set National ~ Quality Standards for certain pollutants known to be hazardous to human health.

Ventilated Façade - A special type of curtain wall consisting of two glazed facades separated by gap through which ~ is allowed to flow.

Short Circuiting: The entry of ~ into an extraction well without first passing through the contaminated zone. Short circuiting may occur through utility trenches, incoherent well or surface seals, or layers of high permeability geologic materials.

A pollutant determined to be hazardous to human health and regulated under EPA's National ~ Quality Standards. The 1970 amendments to the Clean Air Act require EPA to describe the health and welfare impacts of a pollutant as the "criteria" for inclusion in the regulatory regime.

Nitrogen Oxide (NOx) - The result of photochemical reactions of nitric oxide in ~.

A highly reactive molecule containing three oxygen atoms; a dangerous pollutant in ~. In the stratosphere, however, ozone forms an ultraviolet absorbing shield that protects us from mutagenic radiation.
Pacific Decadal Oscillation (PDO) ...

Ambient
Surrounding (for example, ~).
Anaerobic
Requiring the absence of oxygen [compare with aerobic].

Ambient - Surrounding. ~ usually means outdoor air (as opposed to indoor air).

Air pollutants which are not covered by ~ quality standards but which, as defined in the Clean Air Act, may reasonably be expected to cause or contribute to irreversible illness or death.

Powered Air-purifying Respirator (PAPR): An air-purifying respirator that uses a blower to force the ~ through air-purifying elements to the inlet covering.
Power-Operated Hoists: A hoist that is powered by other than human energy.

The Clean Air Act says an "air pollutant" is any "physical, chemical, biological, [or] radioactive substance or matter which is emitted into or otherwise enters the ~." ...

Two two-and-a-half liter (about 26 quarts) flasks in the suitcase fill with ~. In North Africa, an Algerian monk at Assekrem does the same. Around the world, collectors like these are monitoring the cocoon of gases that compose our atmosphere and permit life as we know it to persist.

See also: See also: What is the meaning of Air, Health, Environment, Pollutant, Environmental?

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