Skip to main content
U.S. flag

An official website of the United States government

Here’s how you know

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

HTTPS

Secure .gov websites use HTTPS
A lock (LockA locked padlock) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

    • Environmental Topics
    • Air
    • Bed Bugs
    • Cancer
    • Chemicals, Toxics, and Pesticide
    • Emergency Response
    • Environmental Information by Location
    • Health
    • Land, Waste, and Cleanup
    • Lead
    • Mold
    • Radon
    • Research
    • Science Topics
    • Water Topics
    • A-Z Topic Index
    • Laws & Regulations
    • By Business Sector
    • By Topic
    • Compliance
    • Enforcement
    • Laws and Executive Orders
    • Regulations
    • Report a Violation
    • Environmental Violations
    • Fraud, Waste or Abuse
    • About EPA
    • Our Mission and What We Do
    • Headquarters Offices
    • Regional Offices
    • Labs and Research Centers
    • Planning, Budget, and Results
    • Organization Chart
    • EPA History

Breadcrumb

  1. Home
  2. Hazardous Air Pollutants
  3. About Hazardous Air Pollutants

Health and Environmental Effects of Hazardous Air Pollutants

People exposed to toxic air pollutants at sufficient concentrations and durations may have an increased chance of getting cancer or experiencing other serious health effects. These health effects can include damage to the immune system, as well as neurological, reproductive (e.g., reduced fertility), developmental, respiratory and other health problems. In addition to exposure from breathing air toxics, some toxic air pollutants such as mercury can deposit onto soils or surface waters, where they are taken up by plants and ingested by animals and are eventually magnified up through the food chain. Like humans, animals may experience health problems if exposed to sufficient quantities of air toxics over time. 

Health and ecological effects resources

  • The Health Effects Notebook for Hazardous Air Pollutants - Detailed information about the health effects of hazardous air pollutants (HAPs) is available in separate fact sheets, for nearly every HAP specified in the Clean Air Act Amendments of 1990.
  • Mercury - Learn more about mercury and what is being done to protect your health.
  • Risk Assessment - Learn about EPA Risk Assessments

Hazardous Air Pollutants

  • About Hazardous Air Pollutants
    • What are Hazardous Air Pollutants?
    • Health and Environmental Effects
    • Sources and Exposure
    • Reducing Emissions
  • Urban Air Toxics
    • About Urban Air Toxics
    • Integrated Urban Air Toxics Strategy
    • Pollutants
    • Area Sources of Urban Air Toxics
    • State/Local/Tribal Program Structure
    • Reports to Congress
  • Hazardous Air Pollutant Data and Control Strategies
    • Air Toxics Data Update
Contact Us About Hazardous Air Pollutants
Contact Us to ask a question, provide feedback, or report a problem.
Last updated on February 25, 2025
  • Assistance
  • Spanish
  • Arabic
  • Chinese (simplified)
  • Chinese (traditional)
  • French
  • Haitian Creole
  • Korean
  • Portuguese
  • Russian
  • Tagalog
  • Vietnamese
United States Environmental Protection Agency

Discover.

  • Accessibility Statement
  • Budget & Performance
  • Contracting
  • EPA www Web Snapshot
  • Grants
  • No FEAR Act Data
  • Plain Writing
  • Privacy
  • Privacy and Security Notice

Connect.

  • Data
  • Inspector General
  • Jobs
  • Newsroom
  • Regulations.gov
  • Subscribe
  • USA.gov
  • White House

Ask.

  • Contact EPA
  • EPA Disclaimers
  • Hotlines
  • FOIA Requests
  • Frequent Questions
  • Site Feedback

Follow.