EPA Integrated Science Assessments

http://www.epa.gov/isa/integrated-science-assessment-isa-carbon-monoxide

http://www.epa.gov/isa/integrated-science-assessment-isa-lead

http://www.epa.gov/isa/integrated-science-assessment-isa-nitrogen-dioxide-health-criteria

http://www.epa.gov/isa/integrated-science-assessment-isa-ozone

http://www.epa.gov/isa/integrated-science-assessment-isa-particulate-matter

http://www.epa.gov/isa/integrated-science-assessment-isa-sulfur-dioxide-health-criteria

EPA Science Inventory

http://cfpub.epa.gov/si/

The Health Effects Institute Publications

http://pubs.healtheffects.org/types.php?type=1

http://pubs.healtheffects.org/types.php?type=2