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Topic 4; Particulate Matter/Aerosols in Air
Terms in this set (24)
Particles in the 2.5 - 10 um size range are classified as _________ particles.
Particles in the > 10 um size range are classified as ___________ particles.
Particles in the 0.1 - 2.5 um range are classified as ________ particles.
Particles in the < 0.1 um range are classified as _______ particles.
Most air quality regulations for particulate matter in air are based on (particle size measurement).
Device that is fitted on Hi-Vol air sampler to selectively measure PM₂.₅ or PM₁₀.
Dimethyl sulfide is present in air as a particulate. (True or False)
Particulates in air are typically have a significant amounts of both inorganic and organic substances. (True or False)
Sulfuric acid aerosols are a significant form of particulate in air. (True or False)
Globally, naturally occurring particulates are more numerous than anthropogenic particulates.
False (the other way around)
Reaction of sulfuric acid vapors leads to formation of dimethyl sulfide particulates. (True or False)
An athlete participating in a 12 hour endurance event is breathing at a 24 m³/day rate How many mg of PM₂.₅ particulate matter does this person inhale during the event if the AQI is 400 (350 ug/m³ from the graph)?
Aerosol formed from reactions of gases such as SO₂ are in this mode.
Particles in this mode have the longest atmospheric lifetime.
Particles in this mode are normally formed when smaller particles collide and stick to each other.
Particles formed in this mode represent the least numerous particles, but represent one of the larger contributions to the mass particles.
A particular individual breathes at 14 m³/day rate. How many mg of PM₂.₅ particualte matter does this person inhale over the course of a month (30 days) if the AQI is 250 (200 ug/m³ read from the graph)?
NOx, VOCs, SO₂, particulates
What are the key pollutants in the troposphere?
What is the natural acidity of rain water? What is the substance responsible?
mineral dust in arid regions
What cause alkalinity in pure water?
Natural Organic Emissions
What are sources of particulates in the air?
OSHA classification: Fraction of dust which enters the body, but is trapped in the nose, throat, and upper respiratory tract. Generally > 2.5 um
OHSA Classification Particles small enough to penetrate the nose and upper respiratory system and deep into the lungs...generally beyond the body's natural clearance mechanisms of cilia and mucous, more likely to be retained.
1. Pre-cleaning of coal to reduce mineral content.
2. Cyclones, scrubbers (solids & SO₂), electrostatic precipitators, bag houses
3. Complete combustion (including catalytic converters) to minimize VOCs.
List particulate mitigation methods.
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