air pollution (redirected from National Emission Ceiling)

air pollution

n.

Contamination of air by smoke and harmful gases, mainly oxides of carbon, sulfur, and nitrogen.

---

air pollution

Etymology: L, polluere, to defile

contamination of the air by noxious fumes, aromas, or toxic chemicals.

---

air

the gaseous mixture that makes up the atmosphere. See also air sacs.

---

air capillaries

the minuscule vessels that connect the parabronchi in avian lungs, in which there are no blind-ended tubules.

air cell

the air-filled space between the internal and external shell membranes of a bird's egg.

air changes per hour

the standard measurements used to indicate the level of ventilation in a building especially with respect to removal of humidity, noxious gases and carbon dioxide.

air dried

said of feed that is dried in the open with only natural movement of air, e.g. conventional hay. Contains about 10% water.

air filtration

used as a means of reducing contamination inside a building, the efficiency depending on the pore size of the filter. A technique of some value when combined with temperature control in reducing the prevalence of pneumonia in calves in intensive veal producing units.

air flow rates

are important in assessing the suitability of a ventilating system in animal accommodation. Standards for suitable flow rates for different species and age groups for heating and cooling are available.

air gap technique

in radiography, a technique to reduce scatter of radiation by increasing the distance between the patient and the surface of the cassette.

air hunger

a distressing dyspnea affecting both inspiration and expiration which occurs in paroxysms; characteristic of diabetic acidosis and coma. Called also Kussmaul's respiration.

air movement

includes air changes voiding humidity and gases to the exterior plus movements within the space which facilitate cooling.

air passages

the combined air delivery system of the upper and lower respiratory tracts including nasal cavities, pharynx, laryngeal cavity, trachea, bronchi and bronchioles.

air pollution

contamination of the air with deleterious or esthetically unattractive chemical, physical or biological material. Usually reserved for pollutants generated by humans.

air pump

a small electrically driven appliance used to provide a constant stream of air bubbles to aquaria. The bubbles themselves add little oxygen to the water but the constant disturbance of the surface of the water does.

air quality

the determination of air flow rate, temperature, humidity, freedom from bacteria, solid particles, obnoxious effluvia and poisonous gases—especially hydrogen sulfide and methane from sullage pits under the animal accommodation.

air trapping

dilatation of alveoli without destruction of their walls.

air vesicles

extend radially from parabronchi in the lungs of birds and connect with air capillaries, in which gaseous exchange occurs with vascular capillaries.

---

Patient discussion about National Emission Ceiling.

Q. where would i find list of all the "clean" cities and the rates of air pollution ...?

A. i don't know about a list of "good" cities, but i know a list of the worse cities for Asthmatic people!-
http://www.webmd.com/asthma/news/20050215/americas-worst-asthma-cities