Very small pieces of solid or liquid matter, such as particles of soot, dust, aerosols, fumes, or mists.
In reference to air quality, solid or liquid particles with diameters from 0.03 to 100 microns.
in this report, the term particulate matter has been used interchangeably with particles
refers to all airborne finely divided solid or liquid material with an aerodynamic diameter smaller than 100 microns.
Unburned fuel particles that form smoke or soot and can stick to lung tissue when inhaled. A NAAQS pollutant.
Any material, except uncombined water, which exists in a finely divided form as a liquid or solid at standard conditions.
The suspended particle load that controls the chemistry of the oceans. The physical and chemical properties of the particles control how rapidly a chemical species is removed from solution and incorporated in sediment. The four main sources of this in the oceans are: (1) fluvial input of terrigenic material; (2) aeolian input from wind erosion of continental masses, volcanism and anthropogenic sources; (3) resuspension of sedimentary material by current erosion, earthquakes and slumping; and (4) authigenic production by biota, submarine volcanism and the precipitation of inorganic minerals. See Simpson (1982).
Any liquid or solid particles. "Total suspended particulates", as used in air quality, are those particles suspended in or falling through the atmosphere. They generally range in size (diameter) from 0.1 to 100 micrometers.
Very small particles, such as dust of fiber. The major source of atmospheric particulates includes combustion of coal, gasoline, and fuel oil; cement production; lime kiln operation; incineration; and agricultural burning.
Any aerosol that is released to the atmosphere in either solid or liquid form. [Includes Particulates].
Tiny particles or liquid droplets suspended in the air that can contain a variety of chemical components. Larger particles are visible as smoke or dust and settle out relatively rapidly. The tiniest particles can be suspended in the air for long periods of time and are the most harmful to human health because they can penetrate deep into the lungs. Some particles are directly emitted into the air. They come from a variety of sources such as cars, trucks, buses, factories, construction sites, tilled fields, unpaved roads, stone crushing, and wood burning. Other particles are formed in the atmosphere by chemical reactions.
Carcinogens released into air by emissions from vehicles, they can irritate and harm respitory systems.
Particles formed by incomplete combustion of fuel. Compression ignition (diesel) engines generate significantly higher PM emissions than spark ignited engines. The particles are composed of elemental carbon, heavy hydrocarbons (SOF), and hydrated sulfuric acid ("sulfate particulates").
Solid particles suspended in the air. These solid particles may settle on surfaces depending on whether rain and wind is present. If the particles form the nucleus for the condensation of liquids, they are called aerosols. If particles settle on surfaces in still air, they are referred to as dust or grit.
Finely divided solids or liquids ranging in size from less than 0.1 micron to 50 microns in aerodynamic diameter. Gasses can form particles in the atmosphere through chemical reactions.
a small discrete mass of solid or liquid matter that remains individually dispersed in gas or liquid emissions (usually considered to be an atmospheric pollutant)
very small, separate particles
a fine liquid or solid particle such as smoke, dust, mist, or fumes found in air or engine emissions as a result of incomplete burning of fuels.
Generally refers to all airborne pollutants, which are not gases. Particulate matter can include droplets of liquids or solid matter.
The solid content, primarily soot (carbon) and ash in the exhaust gas normally observed as dark or black smoke.
Particles in the air, such as dust, dirt, soot, smoke, and droplets. Small particles (PM-10 or PM-2.5) have significant effects on human health. Particulate matter is one of the six "criteria" pollutants for which EPA has established national ambient air quality standards.
term used for a mixture of solid particles and liquid droplets suspended in the air.
small particles suspended in the air that are respiratory irritants. Some studies have associated particulate matter with asthma attacks.
Any solid material, except pure water, that is suspended or carried in the air. The size of particulate matter can vary from coarse, wind-blown dust particles to fine particle combustion products.
Particulate Matter is the mixture of solid particles and liquid droplets in the air, including aerosols, smoke, fumes, dust ash and pollen. A major component of smog, particulate matter presents a health risk as well as having environmental impacts such as corrosion and damage to vegetation.
dust, soot, smoke and liquid droplets directly emitted into the air by transportation sources, factories, power plants, construction activity, fires and windblown dust. Secondary particulates (nitrates and sulfates) are formed from gases by atmospheric processes. PM 10 (coarse) and PM 2.5 (fine) are subgroups referring to the particle diameter size limits in microns.
A state of matter in which solid or liquid substances exist in the form of aggregated molecules or particles. Airborne particulate matter is typically in the size range of 0.01 to 100 micrometers.
Particulate matter is a term used to describe dust, soot, smoke and liquid droplets directly emitted into the air, where they are suspended for long periods of time. Particulates can affect breathing and cause respiratory and lung damage. Particulate pollution also can damage paint, soil clothing and reduce visibility. The major sources of particulate matter are industrial processes, smelters, combustion of industrial fuels, fires, natural windblown dust, automobiles, dust from paved andunpaved roads, construction, and agricultural ground-breaking.
Particles in the air, such as dust, dirt, soot, smoke, and liquid droplets; may have significant effects on human health.
Particulate matter, or PM, is the term for particles found in the air, including dust, dirt, soot, smoke, and liquid droplets. Particles can be suspended in the air for long periods of time. Some particles are large or dark enough to be seen as soot or smoke. Others are so small that individually they can only be detected with an electron microscope. Some particles are directly emitted into the air. They come from a variety of sources such as cars, trucks, buses, factories, construction sites, tilled fields, unpaved roads, stone crushing, and burning of wood. Learn More... See Also Particulate Matter, Fine (PM2.5), See Also Particulate Matter, Fine (PM2.5)
A suspension of fine solid or liquid particles in air, i.e. dust, fog, fume, smoke or sprays. Particulate matter suspended in air is commonly known as an aerosol.
Pieces†of air pollution that have been found to penetrate deeply into human lungs. Ethanol helps reduce PM emissions by more than 25 percent.
Solid or liquid particles of soot, dust, smoke, fumes, and aerosols.
Any material, except pure water, that exists in the solid or liquid state in the atmosphere. The size of particulate matter can vary from coarse particle windblown dust to fine particle combustion products.
The solid or liquid particles suspended in the air. The smaller the particles the deeper they penetrate portions of the lung. Particle pollution may affect sensitive people such as children and people with respiratory diseases. There are several classifications of particulate matter based on the diameter of the particle. Particulate matter - 10 are less than 10 micrometers in diameter and particulate matter - 2.5 are less than 2.5 micrometers in diameter.
Solid particles or liquid droplets suspended or carried in the air (e.g., soot, dust, fumes, mist).
criteria air pollutant. Particulate matter includes dust, soot, and other tiny bits of solid materials that are released into and move around in the air. Particulates are produced by many sources, including burning of diesel fuels by trucks and buses, incineration of garbage, mixing and application of fertilizers and pesticides, road construction, industrial processes such as steel making, mining operations, agricultural burning (field and slash burning), and operation of fireplaces and woodstoves. Particulate pollution can cause eye, nose, and throat irritation and other health problems.
A suspension of fine solid or liquid particles in air, such as dust, fog, fume, mist, smoke, or sprays.
Tiny bits of solid material in the air, including smoke, liquid, mist, fumes, or smog, produced by a variety of sources.
Dust, ash, soot, metals and other tiny bits of solid or liquid particles released into the air. Particulate matter comes from natural sources (such as forest fires and volcanoes) and human sources (such as burning of fossil fuels, dust from mining operations, road dust and wood stoves). Particulate matter can cause eye, nose and throat irritation and other health problems.
Fractions of particulate matter characterized by particles with diameters of 10 microns or less (PM-10) or 2.5 microns or less (PM-2.5). Such particles can be inhaled into the air passages and the lungs and can cause adverse health effects. High levels of PM-2.5 are also associated with regional haze and visibility impairment.
A generic term for a broad class of chemically and physically diverse substances that exist as discrete particles (liquid droplets or solids) over a wide range of sizes. A NAAQS pollutant.
A complex mixture of extremely small particles and liquid droplets. It is made up of a number of components, including acids (such as nitrates and sulfates), organic chemicals, metals, and soil or dust particles.
Unburned fuel particles that form smoke or soot and stock to lung tissue when inhaled. A chief component of exhaust emissions from heavy-duty diesel engines.
Solid or liquid material in the atmosphere that includes wind blown dust and soot from combustion sources. Very fine particulates, those that are under 2.5 microns in size (PM 2.5), are the most effective for causing visibility impairment.
A particle of soil or liquid matter (e.g., soot, dust, aerosols, fumes and mist).
small dirt particles suspended in MRF or microscopic particles suspended in air.
Fine divided solid particles suspended in polluted air.
liquid or solid particles such as dust, smoke, mist or smog found in air emissions. Particulate matter causes respiratory illness and is a cancer causing substance.
Solid particles or liquid droplets that are small enough to remain suspended in the air. Also called aerosols.
Tiny pieces of solid or liquid matter, such as soot, dust, fumes, or mist.
Particles of dust, soot, salt, sulfate compounds, pollen, or other particles suspended in the atmosphere.
Microscopic solid and liquid particles, of human and natural origin, that remain suspended in the air for some time. Particles give smog its color and affect visibility, and are believed to have adverse affects on vegetation and on various synthetic and natural surfaces.
Any solid liquid material in the atmosphere.
In air pollution control, solid or liquid particles, except water, visible with or without a microscope, that make up the obvious portion smoke.
ParticulateMatter (PM) is made up of very tiny solid or liquid particles that are small enough to remain suspended in the air. These include dust, smoke, fumes, spray and mist.