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Environmental Monitoring Technologies: Air Quality Assessment

Description: This quiz will test your knowledge on various technologies used for air quality assessment.
Number of Questions: 14
Created by:
Tags: environmental monitoring air quality pollution sensors monitoring systems
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Which of the following is a common method for measuring particulate matter (PM) in the air?

  1. Gas chromatography

  2. Nephelometry

  3. Spectrophotometry

  4. Gravimetric analysis

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Correct Option: D
Explanation:

Gravimetric analysis involves collecting PM on a filter and measuring its weight before and after sampling.

What is the primary pollutant measured by a chemiluminescence analyzer?

  1. Carbon monoxide (CO)

  2. Nitrogen dioxide (NO2)

  3. Ozone (O3)

  4. Sulfur dioxide (SO2)

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Correct Option: B
Explanation:

Chemiluminescence analyzers measure NO2 by reacting it with ozone (O3) to produce light, which is then detected.

Which of the following is a type of sensor used to measure volatile organic compounds (VOCs) in the air?

  1. Photoionization detector (PID)

  2. Flame ionization detector (FID)

  3. Gas chromatography-mass spectrometry (GC-MS)

  4. Electrochemical sensor

Show answer
Correct Option: A
Explanation:

PIDs measure VOCs by ionizing them with ultraviolet light and detecting the resulting ions.

What is the purpose of a nephelometer in air quality monitoring?

  1. Measuring the concentration of ozone (O3)

  2. Measuring the concentration of particulate matter (PM)

  3. Measuring the concentration of sulfur dioxide (SO2)

  4. Measuring the concentration of nitrogen dioxide (NO2)

Show answer
Correct Option: B
Explanation:

Nephelometers measure the scattering of light by particles in the air, which is used to estimate the concentration of PM.

Which of the following is a common method for monitoring air quality in real-time?

  1. Passive sampling

  2. Active sampling

  3. Continuous monitoring

  4. Grab sampling

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Correct Option: C
Explanation:

Continuous monitoring involves collecting and analyzing air samples continuously over time to provide real-time data on air quality.

What is the primary pollutant measured by a flame ionization detector (FID)?

  1. Carbon monoxide (CO)

  2. Nitrogen dioxide (NO2)

  3. Ozone (O3)

  4. Total hydrocarbons (THC)

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Correct Option: D
Explanation:

FIDs measure THC by burning them in a hydrogen flame and detecting the resulting ions.

Which of the following is a type of sensor used to measure carbon monoxide (CO) in the air?

  1. Electrochemical sensor

  2. Photoionization detector (PID)

  3. Gas chromatography-mass spectrometry (GC-MS)

  4. Nephelometer

Show answer
Correct Option: A
Explanation:

Electrochemical sensors measure CO by reacting it with an electrolyte to produce an electrical signal.

What is the purpose of a gas chromatography-mass spectrometry (GC-MS) system in air quality monitoring?

  1. Measuring the concentration of particulate matter (PM)

  2. Measuring the concentration of volatile organic compounds (VOCs)

  3. Measuring the concentration of sulfur dioxide (SO2)

  4. Measuring the concentration of nitrogen dioxide (NO2)

Show answer
Correct Option: B
Explanation:

GC-MS systems are used to separate and identify VOCs in air samples.

Which of the following is a common method for collecting air samples for subsequent analysis?

  1. Passive sampling

  2. Active sampling

  3. Continuous monitoring

  4. Grab sampling

Show answer
Correct Option: D
Explanation:

Grab sampling involves collecting a single air sample at a specific time and location.

What is the primary pollutant measured by a spectrophotometer in air quality monitoring?

  1. Carbon monoxide (CO)

  2. Nitrogen dioxide (NO2)

  3. Ozone (O3)

  4. Sulfur dioxide (SO2)

Show answer
Correct Option: D
Explanation:

Spectrophotometers measure SO2 by detecting the absorption of ultraviolet light by SO2 molecules.

Which of the following is a type of sensor used to measure ozone (O3) in the air?

  1. Electrochemical sensor

  2. Photoionization detector (PID)

  3. Ultraviolet (UV) sensor

  4. Gas chromatography-mass spectrometry (GC-MS)

Show answer
Correct Option: C
Explanation:

UV sensors measure O3 by detecting the absorption of ultraviolet light by O3 molecules.

What is the purpose of a passive sampler in air quality monitoring?

  1. Collecting air samples for subsequent analysis

  2. Measuring air quality in real-time

  3. Calibrating air quality monitoring instruments

  4. Providing meteorological data for air quality modeling

Show answer
Correct Option: A
Explanation:

Passive samplers collect air samples over a period of time, which are then analyzed to determine the concentration of pollutants.

Which of the following is a common method for monitoring air quality over a large area?

  1. Passive sampling

  2. Active sampling

  3. Continuous monitoring

  4. Remote sensing

Show answer
Correct Option: D
Explanation:

Remote sensing involves using sensors mounted on satellites, aircraft, or other platforms to collect air quality data over a large area.

What is the primary pollutant measured by an electrochemical sensor in air quality monitoring?

  1. Carbon monoxide (CO)

  2. Nitrogen dioxide (NO2)

  3. Ozone (O3)

  4. Sulfur dioxide (SO2)

Show answer
Correct Option: A
Explanation:

Electrochemical sensors measure CO by reacting it with an electrolyte to produce an electrical signal.

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