Exploratory Data Analysis - PM2.5 Emissions

Analysis of fine particulate matter (PM2.5) emissions in the United States using data from the EPA's National Emissions Inventory (NEI) for the years 1999, 2002, 2005, and 2008.

Data

• summarySCC_PM25.rds — PM2.5 emissions data by source, county, and year
• Source_Classification_Code.rds — Mapping from SCC codes to source names

Download from: EPA NEI Data

Questions Addressed

Script	Plot	Question
plot1.R	plot1.png	Have total PM2.5 emissions decreased in the US from 1999 to 2008?
plot2.R	plot2.png	Have total PM2.5 emissions decreased in Baltimore City, MD?
plot3.R	plot3.png	Which source types have seen decreases/increases in Baltimore City?
plot4.R	plot4.png	How have coal combustion-related emissions changed across the US?
plot5.R	plot5.png	How have motor vehicle emissions changed in Baltimore City?
plot6.R	plot6.png	Baltimore City vs Los Angeles County motor vehicle emissions comparison

How to Run

1. Place summarySCC_PM25.rds and Source_Classification_Code.rds in the project root
2. Run each script: Rscript plot1.R, Rscript plot2.R, etc.
3. Each script generates the corresponding PNG file