Where It Comes From
Exhaust from diesel trucks, buses, trains, ships, and construction or farm equipment; highest near busy roads, ports, and rail yards [1][4].
How You Are Exposed
Breathing outdoor air near traffic, inside vehicles in traffic, near idling engines, and when outdoor air leaks indoors [1][5].
Why It Matters
Can trigger coughing, wheezing, asthma attacks, worsen COPD, raise heart attack and stroke risk, and long-term exposure to diesel exhaust increases lung cancer risk [1][2][3].
Who Is at Risk
Children, older adults, pregnant people, those with asthma/COPD/heart disease, outdoor workers, and communities near heavy diesel traffic [1][4][5].
How to Lower Your Exposure
Check the Air Quality Index; limit time/strenuous activity near busy roads; keep distance from idling diesels; in vehicles, use recirculate and close windows; use a HEPA air cleaner at home; support no‑idling and cleaner diesel programs [1][4][5].
References
- [1]U.S. EPA. Health and Environmental Effects of Particulate Matter (PM).
- [2]IARC Monographs. Diesel Engine Exhaust, Group 1 carcinogen (2012).
- [3]NTP, Report on Carcinogens. Diesel Exhaust Particulates—Known to be a Human Carcinogen.
- [4]WHO. Global Air Quality Guidelines (2021) and ambient air pollution health effects.
- [5]CDC. Air Pollution and Your Health; guidance on AQI and exposure reduction.