Pollutant Emissions, millions of tonslyear CO VOC NOx PM-10 SOx Lead Source Cate

Question

Pollutant Emissions, millions of tonslyear CO VOC NOx PM-10 SOx Lead Source Category Mobile Sources On-Road Vehicles 1980 2008 1980 2008 1980 20081980 2008 1980 2008 1980 2008 143.8 38.9 13.9 3.4 11.5 5.2 04 0.3 0.5 0.1 60.5 0.0 0.1 0.047.2 0.0 0.1 0.0 11.7 0.0 0.0 0.0 0.3 0.1 0.0 0.0 0.0 0.1 0.1 0.1 0.3 0.5 0.9 0.8 64.7 0.2 Gasol. Cars & motorcycles 98.720.4 29.2 13.5 5.3 4.7 0.6 0.3 1.3 1.0 0.3 0.1 0.3 0.1 14.3 18.0 9.1 1.7 2.7 1.2 1.7 0.4 04 0.1 0.4 0.2 0.0 0.0 0.0 0.0 2.22.6 6.6 1.7 0.1 0.1 1.6 1.1 0.1 0.0 0.6 0.3 0.0 0.0 2.7 2.1 0.2 0.2 0.2 0.2 0.0 0.0 0.5 0.7 0.0 0.1 0.4 0.8 0.0 0.0 3.4 4.2 0.3 0.2 Gasol. Pick-ups & SUVs Heavy Gasol. Trucks Diesel (Cars, Trucks, Buses) Aircraft Railroads Marine Vessels Other Non-Road2 Total Mobile Sources Total All Souces3 Percent Mobile Sources 1.6 0.0O 0.0 0.0 0.9 0.1 na na 3.3 0 na na 160.0 58.1 16.5 6.2 6.0 11.10.70.6 185.4 77.7 31.1 5.9 27.1 16.3 7.0 17.4 25.9 11.4 74.2 3.8 86% 75% 53% 39% 59% 68% 10% 3% 3% 7% 87% 5% For lead, units are thousands of tons per year

Explanation / Answer

% change in emission = (concentration in 2008 - concentration in 1980)*100/(concentration in 1980)

Part a

For CO

% change = (38.9-143.8)*100/143.8 = - 72.95%

Negative sign shows the emission decreased.

Part b

For VOC

% change = (3.4-13.9)*100/13.9 = - 75.54%

Negative sign shows the emission decreased.

Part c

For PM-10

% change = (0.3-0.4)*100/0.4 = -25%

Negative sign shows the emission decreased.

Part d

For NOx

% change = (5.2-11.5)*100/11.5 = -54.78%

Negative sign shows the emission decreased.

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