Human Exposure to Ultrafine Particles—Sources, Concentrations, Indoor-Outdoor Relationships, and Mitigation Techniques

July 22, 2013 - 12:00pm - 1:00pm
Seminar Host/Point of Contact: 

Ultrafine particles (UFP) are implicated in morbidity (oxidative stress) and mortality (cardiorespiratory disease).  They are so tiny (<100 nm in diameter) that they can evade cell defenses and perhaps can bypass the blood-brain barrier.  Unlike larger particles (PM2.5, PM10) they are not monitored regularly in outdoor air.  This has left a gap in our knowledge of outdoor concentrations and the major outdoor sources. 

A similar gap exists in our knowledge of indoor concentrations and sources.  Recent studies suggest that cooking, whether on gas or electric stoves, may be the major indoor source for most people. In this presentation, the basic findings of the influence of cooking will be reviewed in detail, including a surprising discovery about the size distribution of cooking aerosols.

Total indoor exposure depends on both indoor sources and outdoor infiltration.  The crucial parameter is the infiltration factor.  Results suggest that whereas PM2.5 and PM10 may have typical infiltration factors near 0.5 (50% of the particle concentration in outdoor air will be airborne indoors at equilibrium), the equivalent value for UFP may be closer to 0.25.  This downweights the importance of outdoor air for personal exposure, and thus makes indoor air sources and mitigation techniques for UFP relatively more important than for PM in general.  For example, we will explore filtration and kitchen exhaust fans as possible remedies. 

A recording of this seminar is available at:

Add event to Google Calendar

Announcement List

To be added to our seminar annoucement list please, email ETA Seminars. Seminars may change without notice, stay informed by joining our seminar email list. 

Site Access

For site access please email your request to ETA Seminars. To arrive at Building 90 via the LBNL shuttle, take "Blue Uphill". Click here for the shuttle schedule. To ensure your site access is set-up send your request 36 hours in advance of the seminar.

Remote Access

Not able to attend in person? Remote participants can use ReadyTalk Audio & Net conference to phone in to listen, while viewing the presentation via the ReadyTalk site.

Web Access Code: 4864835

USA & Canada call-in number:
1 (866) 740-1260
Access Code: 4864835#

International callers:
Please visit this website to see if a toll-free call-in number is available for your international location.

If not, you will need to pay for the call yourself and use this phone number:

(303) 248-0285.