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Air Pollution Measurements and Emission Estimates

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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?

To define the pollutant Signup and view all the answers

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

Pollutant molar flow rate = (gas flow rate) x (pollutant concentration in gas) Signup and view all the answers

When is averaging necessary in determining pollutant flow rate?

When the stack velocity and concentration are different at every point and time Signup and view all the answers

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

To maintain isokinetic flow into the sampling probe Signup and view all the answers

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

To ensure accurate measurement of the sample weight Signup and view all the answers

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

0.1405 g Signup and view all the answers

What is the purpose of EPA standard methods?