Includes code for reading the data so that the plot can be fully reproduced
Plot 1 answers the question :
Have total emissions from PM2.5 decreased in the United States from 1999 to 2008?
Uses the base plotting system
Shows the total PM2.5 emission from all sources for each of the years 1999, 2002, 2005, and 2008
Plot 2 answers the question :
Have total emissions from PM2.5 decreased in the Baltimore City, Maryland (fips == "24510") from 1999 to 2008?
Plot 3 answers the question :
Of the four types of sources indicated by the type (point, nonpoint, onroad, nonroad) variable, which of these four sources have seen decreases in emissions from 1999–2008 for Baltimore City?
Which have seen increases in emissions from 1999–2008?
Plot 4 answers the question :
Across the United States, how have emissions from coal combustion-related sources changed from 1999–2008?
Plot 5 answers the question :
How have emissions from motor vehicle sources changed from 1999–2008 in Baltimore City?
Plot 6 answers the question :
Compare emissions from motor vehicle sources in Baltimore City with emissions from motor vehicle sources in Los Angeles County, California (fips == "06037"). Which city has seen greater changes over time in motor vehicle emissions?
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