Air Pollution Measurements and Emission Estimates
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Questions and Answers

What was the tare weight of the fresh filter?

  • 0.1405 g
  • 4.2 g
  • 21 µg
  • 0.1400 g (correct)

What is the measured change in filter weight?

  • 1 mg
  • 0.5 mg (correct)
  • 0.1 mg
  • 5 mg

What is the average PM2.5 concentration in the air drawn through the sampler?

  • 18 µg/m³
  • 19 µg/m³
  • 20 µg/m³
  • 21 µg/m³ (correct)

What is the purpose of EPA standard methods for air pollutants?

<p>To define the pollutant (B)</p> Signup and view all the answers

What is the formula to calculate the pollutant molar flow rate?

<p>Pollutant molar flow rate = (gas flow rate) x (pollutant concentration in gas) (A)</p> Signup and view all the answers

When is averaging necessary in determining pollutant flow rate?

<p>When the stack velocity and concentration are different at every point and time (C)</p> Signup and view all the answers

What is the importance of isokinetic sampling in stack sampling for particulates?

<p>To maintain isokinetic flow into the sampling probe (D)</p> Signup and view all the answers

Why is high-quality weighing and sample humidity control needed?

<p>To ensure accurate measurement of the sample weight (B)</p> Signup and view all the answers

What is the gross weight of the filter dried to the same humidity as the fresh filter?

<p>0.1405 g (D)</p> Signup and view all the answers

What is the purpose of EPA standard methods?

<p>To define the pollutant (C)</p> Signup and view all the answers

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