AIR POLLUTION

(Elective-I)

Numerical on units of measurement and conversion

1) If SO2, CO and NO2 are found out to be 1000 ppm, 600 ppm and 200 ppm respectively in a

air quality survey. What are concentrations in µg/m3?

2) If concentrations of SO2, CO and NO2 are given as 1200 ppm, 4000 ppm and 500 ppm

respectively. What are their concentrations in µg/m3?

3) The concentration of CO reaches in room to a level of 400 ppm. Express this value in µg/m3.

4) The average daily concentration off SO2 is observed to be 415 µg/m3 at 250 C and 1

atmospheric pressure. Find out concentration of SO2 in ppm.

5) The ozone concentration at 00 C and 1 atmospheric pressure found out to be 118 µg/m3.Find

concentration of ozone in ppb.

6) Calculate concentrations of following air pollutants in µg/m3.Assume STP conditions

i) SO2 – 1100 ppm

ii) CO – 1500 ppm

iii) NO2 – 800 ppm

7) The exhaust gas from an automobile contains 1.5% by volume of CO. What is concentration

of CO in mg/m3 at 250 C and 1 atmospheric pressure?

8) The exhaust gas from an automobile contains 1.0% by volume of CO. What is concentration

of CO in mg/m3 at 250 C and 1 atmospheric pressure?

9) The ozone concentration is observed to be 80 µg/m3 at an urban monitoring station. Does the

value exceed the standard clean air?

10) The NO and CO content of sample of air at 220 C and 1 atmospheric pressure is 20 and 100

ppm respectively. Calculate their concentration in µg/m3?

11) Convert the following into ppm at 300 C

i) Ozone – 25 µg/m3

ii) H2S – 15 µg/m3

12) Convert ozone concentration of 0.2 ppm to µg/m3if temperature is 300 C.

13) 250 µg/m3 of ozone is present in the atmosphere at 25 0 C. What is the concentration of ozone

in ppm and ppb.

14) H2S concentration in the atmosphere is 25 ppm at 25 0 C. What is equivalent concentration in

mg/m3?

15) Do as directed

i) CO – 100 µg/m3 (convert to ppb)

ii) NO – 10 ppm (convert to mg/m3)