Page 49 - Air pollution and greenhouse gases from basic concepts to engineering applications for air emission control

22 1 Air Emissions

2. Which one of the following is NOT one of the criteria air pollutants set by US
National Ambient Air Quality Standards
a. Ozone
b. Carbon dioxide
c. Sulfur dioxide
d. Lead
3. Which air pollution control approach has the greatest simplicity with the least
flexibility?

a. Emission standards
b. Air quality standards
c. Emission taxes
d. Both b and c above

1.8.2 Calculations

1. The national ambient air quality standard for ozone is 0.08 ppmv measured over
3
an eight hour averaging time. What is the equivalent concentration in μg/m at
25 °C?
2. The primary air quality standard for sulphur dioxide (SO 2 ) measured over 24 h
3
averaging time is 0.14 ppmv. What is the equivalent concentration in μg/m at
1 atm and 25 °C?
3. The primary air quality standard for nitrogen dioxide (NO 2 ) as an annual
3
average is 100 μg/m . What is the equivalent concentration in ppmv at 1 atm
and 25 °C?
4. The exhaust gas from automobile contains 8,000 ppmv of carbon monoxide
(CO).
3
a. What is the equivalent concentration in g/m at 1 atm and 25 °C?
3
b. What is the concentration in exhaust pipe in g/m if it is at 220 °C and
1.2 atm?
3
5. The exhaust gas from automobile contains 20 μg/m of lead.
a. What is the equivalent concentration in ppmm at 1 atm and 25 °C?
3
b. What is the concentration in exhaust pipe in μg/m if it is at 200 °C and
1.1 atm?
6. At 25 °C and 1 atm pressure the ozone concentration at a monitoring site is
3
180 μg/m .
a. What is the equivalent concentration in ppmm at 1 atm and 25 °C?
b. Does this concentration exceeds the national ambient air quality standard of
0.08 ppmv (based on an 8 h average value)?