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PH-Ch12

DrDavidMcSwane Exam2

QuestionAnswer
What is aerodynamic diameter? Particles categorized according to their size using this measure. This is the diameter of a uniform sphere of unit density that would attain the same terminal settling velocity as the particle of interest.
What is coarse PM (PM10-2.5)? PM10 = particles with an aerodynamic diameter between 2.5 and 10 microns.
What are criteria pollutants? A regulatory category of major pollutants (carbon monoxide, lead, nitrogen dioxide, ozone, particulates, sulfur oxides) for which EPA assesses under the Clean Air Act (NAAQS).
WHat are fine PM? PM2.5 has an aerodynamic diameter up to 2.5 microns.
What is ground-level ozone? Sometimes called tropospheric ozone- a harmful pollutant.
What are hazardous air pollutants? A regulatory category established by the Clean Air Act which includes volatile organic chemicals, pesticides, herbicides, and radionuclides.
What are nitrogen oxides? Make up a category of high reactive gases containing nitrogen and oxygen, such as nitrogen dioxide (NO2) and nitrogen oxide (NO). Produced through combustion of fossil fuels (ie car & truck engines, electric utilities, & industries).
What is the ozone layer? Stratospheric ozone forms this naturally occurring layer that protects us from ultraviolet radiation.
What are particular matter Refers to a generic class of pollution rather than to a particular, individual pollutant with a specified structure- includes solid or liquid particles in the air.
What is a primary pollutant? An air pollutant directly emitted in the atmosphere (i.e. car tailpipe of carbon monoxide).
What is a secondary pollutant? When a pollutant is formed in the atmosphere through physical or chemical conversion (from water vapor or sunlight).
What is sulfur dioxide? Is a water-soluble gas that was a primary component of the 1952 London fog (from coal and metal ores).
What are total suspended particles (TSP)? Refers to almost all particles in the air and is typically measured as PM mass of particles up to about 45 microns in aerodynamic diameter.
What is troposopheric ozone? Is a colorless gas and a photochemical oxidant formed through complex, nonlinear chemical reactions involving the precursors VOCs and NOx in the presence of sunlight.
What is ultrafine PM? Particles that have an aerodynmic diameter up to 0.1 microns.
What are volatile organic compounds? A category of organic chemicals with a high vapor pressure which readily evaporate at normal temperature and pressure (benzene, chloroform, formaldehyde, isoprene, methanol, monoterprenes, etc.).
What is biogenic? Natural pollutants including volatile organic compounds from vegetation, pollens, volcanic gases and dust from deserts.
What is anthropogenic? Pollutants result from human activity.
Created by: dustycody
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