About
Lynn Hildemann is the Wayne Loel Professor of Sustainability and Senior Associate Dean for Education at Stanford University in the Department of Civil and Environmental Engineering. Her current research focuses on the sources and dispersion of airborne particulate matter indoors, as well as the assessment of human exposure to air pollutants. She received her BS, MS, and PhD degrees in environmental engineering science from the California Institute of Technology. Professor Hildemann has authored over 100 peer-reviewed publications, including two with over 1000 citations each and six with over 500 citations each. She has been recognized with several awards, such as Young Investigator Awards from NSF and ONR, the Kenneth T. Whitby Award from the AAAR, and Stanford's Gores Award for Teaching Excellence. Additionally, she was a co-recipient of the Haagen-Smit Outstanding Paper Award from Atmospheric Environment. She has served on advisory committees for the Bay Area Air Quality Management District and the California Air Resources Board, and has held editorial roles for prominent journals including Environmental Science & Technology and Aerosol Science and Technology. At Stanford, she has served as chair of the Department of Civil & Environmental Engineering, an elected member of the Faculty Senate, and has chaired various university committees.
Research topics
- Chemistry
- Environmental science
- Environmental health
- Medicine
- Environmental chemistry
- Materials science
Selected publications
SSRN Electronic Journal · 2026-01-01
preprintOpen accessMachine Learning with Applications · 2026-04-18
articleOpen accessSenior authorSSRN Electronic Journal · 2026-01-01
preprintOpen accessNeural Computing and Applications · 2024-05-11 · 2 citations
articleSenior authorThe Science of The Total Environment · 2023-06-29 · 4 citations
articleSenior authorSSRN Electronic Journal · 2023-01-01
preprintOpen accessSenior authorSSRN Electronic Journal · 2022-01-01
articleOpen accessSenior authorThe Science of The Total Environment · 2022-08-26 · 21 citations
articleOpen accessSenior authorThe widespread legalization of recreational marijuana raises growing concerns about exposure to secondhand marijuana smoke. An important location for marijuana smoking is the home, but few measurements of air pollutant concentrations in the home are available for a marijuana joint fully smoked in one of its rooms. We used research grade calibrated real-time continuous PM2.5 air monitors in controlled 5-hour experiments to measure fine particle concentrations in the 9 rooms of a detached, two-story, 4-bedroom home with either a tobacco cigarette or a marijuana joint fully smoked in the home's living room. The master bedroom's door was closed, and the other bedroom doors were open, as was the custom of occupants of this residence. In two experiments with a Marlboro tobacco cigarette smoked by a machine in the living room, the 5-hour mean PM2.5 concentrations in 9 rooms of the home were 15.2 μg/m3 (SD 5.6 μg/m3) and 15.0 μg/m3 (SD 3.7 μg/m3). In contrast, three experiments with pre-rolled marijuana joints smoked in the same manner in the living room produced 5-hour mean PM2.5 concentrations of 38.9 μg/m3 (SD 10.6 μg/m3), 79.8 μg/m3 (SD 25.7 μg/m3) and 80.7 μg/m3 (SD 28.8 μg/m3). In summary, the average secondhand PM2.5 concentrations from smoking a marijuana joint in the home were found to be 4.4 times as great as the secondhand PM2.5 concentrations from smoking a tobacco cigarette. Opening 3 windows by 12.7 cm reduced the high PM2.5 concentrations from marijuana smoking by 67 %, but the PM2.5 levels still exceeded those produced by tobacco smoking with the windows closed.
Atmospheric Environment X · 2021 · 44 citations
Senior authorCorresponding- Environmental science
- Chemistry
- Medicine
Fifteen states have legalized the sales of recreational marijuana, and California has the largest sales of any state. Cannabis is most often smoked indoors, but few measurements have been made of fine particle mass concentrations produced by secondhand cannabis smoke in indoor settings. We conducted 60 controlled experiments in a 43 m3 room of a residence, measuring PM2.5 concentrations, emission rates, and decay rates using real-time monitors designed to measure PM2.5 mass concentrations. We also measured the room's air exchange rate. During each experiment, an experienced smoker followed an identical puffing protocol on one of four different methods of consuming marijuana: the pre-rolled marijuana joint (24 experiments), the bong with its bowl containing marijuana buds (9 experiments), the glass pipe containing marijuana buds (9 experiments), and the commercially available electronic vaping pen with a cartridge attached containing cannabis vape liquid (9 experiments). For comparison, we used the same puffing protocol to measure the PM2.5 emissions from Marlboro cigarettes (9 experiments). The results indicated that cannabis joints produced the highest indoor PM2.5 concentrations and had the largest emission rates, compared with the other cannabis sources. The average PM2.5 emission rate of the 24 cannabis joints (7.8 mg/min) was 3.5 times the average emission rate of the Marlboro cigarettes (2.2 mg/min). The average emission rate of the cannabis bong was 67% that of the joint; the glass pipe's emission rate was 54% that of the joint, and the vaping pen's emission rate was 44% that of the joint. The differences compared to the joint were statistically significant.
The Science of The Total Environment · 2021-08-25 · 20 citations
articleSenior author
Recent grants
Frequent coauthors
- 48 shared
Bernd R.T. Simoneit
Oregon State University
- 48 shared
Glen R. Cass
Georgia Institute of Technology
- 38 shared
Kai-Chung Cheng
San Diego State University
- 36 shared
Wayne R. Ott
Stanford University
- 33 shared
Neil E. Klepeis
San Diego State University
- 29 shared
Wolfgang F. Rogge
University of California, Merced
- 27 shared
Monica A. Mazurek
- 22 shared
Viviana Acevedo-Bolton
Stanford University
Education
- 1993
Ph.D., Environmental Engineering
Stanford University
- 1989
M.S., Environmental Engineering
Stanford University
- 1986
B.S., Environmental Engineering
University of California, Berkeley
Awards & honors
- Kenneth T. Whitby Award from the AAAR (1998)
- Stanford's Gores Award for Teaching Excellence (2013)
- Young Investigator Awards from NSF
- Young Investigator Awards from ONR
- Atmospheric Environment’s Haagen-Smit Outstanding Paper Awar…
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