Enclosed Parking Facilities

Why am I being warned about potential exposure to chemicals in enclosed parking facilities?

  • Some chemicals in enclosed parking facilities are on the Proposition 65 list because they can cause cancer and/or birth defects or other reproductive harm.
  • Proposition 65 requires businesses to determine if they must provide a warning about exposures to listed chemicals.

Enclosed parking facilities can expose you to chemicals on the Proposition 65 list.

Icon representing enclosed parking facilities


  • Carbon monoxide and other chemicals in exhaust from diesel and gasoline engines can accumulate in enclosed parking facilities.
Carbon monoxide and other engine exhaust chemicals are emitted into the air in enclosed parking facilities
People breathe in air containing chemicals in exhaust emissions
  • During pregnancy, chemicals released into the air in enclosed parking facilities can pass from mother to baby.

How can I reduce my exposure to engine exhaust in enclosed parking facilities?

  • When you use enclosed parking facilities, stay no longer than necessary.
  • To the extent practical, do not stand next to idling or operating vehicle engines.  Carbon monoxide in enclosed areas can build up very quickly.

For more information:

General Fact Sheets and Resources

Proposition 65

  • California Environmental Protection Agency (CalEPA)
    Office of Environmental Health Hazard Assessment (OEHHA)
Posted March 2018

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