Engineering professor at Virginia Tech with expertise in air pollution, airborne microbes, nanotechnology. Avid recreational athlete.https://bsky.app/profile/linseymarr.bsky.socialhttps://bsky.app/profile/linseymarr.bsky.social/post/3ml6yylfmg225"the crew frequently cleans hand rails and other high-contact surfaces" but are they also opening the windows and filtration-maxxing? https://www.nytimes.com/2026/05/06/world/hantavirus-cruise-ship.html?unlocked_article_code=1.gVA.5nk2.FPyZqSSjetil&smid=bs-share06 May 2026 15:22 +0000at://did:plc:2gq74q25wxvtfd34zfknnalc/app.bsky.feed.post/3ml6yylfmg225https://bsky.app/profile/linseymarr.bsky.social/post/3ml4roxns2c23There is some evidence of person-to-person transmission of the Andes species of hantavirus. https://www.nejm.org/doi/full/10.1056/NEJMoa2009040 https://pmc.ncbi.nlm.nih.gov/articles/PMC7101103/ [contains quote post or other embedded content]05 May 2026 18:06 +0000at://did:plc:2gq74q25wxvtfd34zfknnalc/app.bsky.feed.post/3ml4roxns2c23https://bsky.app/profile/linseymarr.bsky.social/post/3ml4hxpjyw223Does hantavirus spread person-to-person in rare cases? https://www.wsj.com/world/human-to-human-transmission-of-hantavirus-may-have-occurred-on-cruise-ship-e041b990?st=AqPhbp&reflink=desktopwebshare_permalink A review from 2022 did not find evidence of it. https://pmc.ncbi.nlm.nih.gov/articles/PMC9574657/.05 May 2026 15:12 +0000at://did:plc:2gq74q25wxvtfd34zfknnalc/app.bsky.feed.post/3ml4hxpjyw223https://bsky.app/profile/linseymarr.bsky.social/post/3mkzt2rnjsc2tI received a couple of anonymous "thank an advisor" messages from students @virginiatech.bsky.social today. It's one of the best feelings in the world to know that I have had a positive impact on a young person's academic and personal journey.04 May 2026 13:53 +0000at://did:plc:2gq74q25wxvtfd34zfknnalc/app.bsky.feed.post/3mkzt2rnjsc2thttps://bsky.app/profile/linseymarr.bsky.social/post/3mkamyzmf3c2z@corsiaq.bsky.social and I wrote a viewpoint on Indoor Air Quality: An Overdue Awakening addressing 1. policies for public vs. private spaces 2. ultrapure vs. "clean enough" air 3. simple vs. complex solutions @arpa-h.bsky.social https://pubs.acs.org/doi/10.1021/acs.est.6c0299824 Apr 2026 13:28 +0000at://did:plc:2gq74q25wxvtfd34zfknnalc/app.bsky.feed.post/3mkamyzmf3c2zhttps://bsky.app/profile/linseymarr.bsky.social/post/3mhqrnrysa22bDo I know anyone who has a UV-based SO2 analyzer (e.g., Thermo 43C, 43i) that can go down to 50 ppb? Looking to borrow one for a few months.23 Mar 2026 19:18 +0000at://did:plc:2gq74q25wxvtfd34zfknnalc/app.bsky.feed.post/3mhqrnrysa22bhttps://bsky.app/profile/linseymarr.bsky.social/post/3mhgbp4vxis2fOur paper "Controlled human influenza infection reveals heterogeneous expulsion of infectious virus into air" is now published in Cell. Free access until 8 May 2026 at https://authors.elsevier.com/c/1mo9AL7PXy2MH #FluLab19 Mar 2026 15:06 +0000at://did:plc:2gq74q25wxvtfd34zfknnalc/app.bsky.feed.post/3mhgbp4vxis2fhttps://bsky.app/profile/linseymarr.bsky.social/post/3mh6u5irf622aI recorded a @virginiatech.bsky.social Curious Conversations podcast about stuff in the air that makes us sick and our project funded by @arpa-h.bsky.social on a smart building system to ensure cleaner, healthier indoor air. https://news.vt.edu/articles/2026/03/research-curiousconversations-Marr.html16 Mar 2026 16:15 +0000at://did:plc:2gq74q25wxvtfd34zfknnalc/app.bsky.feed.post/3mh6u5irf622ahttps://bsky.app/profile/linseymarr.bsky.social/post/3mfssgje3qs2dThere has been a lot of interesting research on the pH of respiratory droplets and how it affects flu virus. We looked at large saliva droplets exposed to low and high CO2 and only saw a difference in viability at 80% RH with low CO2. pH changes were small. https://pubs.acs.org/doi/10.1021/acs.est.5c1267227 Feb 2026 03:47 +0000at://did:plc:2gq74q25wxvtfd34zfknnalc/app.bsky.feed.post/3mfssgje3qs2dhttps://bsky.app/profile/linseymarr.bsky.social/post/3mfjvgbnlvk27Our latest paper shows that most aerosol sampling methods may underestimate infectious virus in air. We observed 100x more infectious flu virus and SARS-CoV-2 if it deposited directly on cells (more realistic) rather than in liquid first and then transferred to cells. https://pubs.acs.org/doi/full/10.1021/acs.estlett.6c0002023 Feb 2026 14:47 +0000at://did:plc:2gq74q25wxvtfd34zfknnalc/app.bsky.feed.post/3mfjvgbnlvk27https://bsky.app/profile/linseymarr.bsky.social/post/3mdvmxxf2yc2tTo study influenza infections, we inoculated human participants with aerosolized virus: coarse particles generated by a flow-focusing monodisperse aerosol generator and fine particles generated by a medical nebulizer. https://academic.oup.com/jid/article-abstract/doi/10.1093/infdis/jiaf603/837677302 Feb 2026 19:57 +0000at://did:plc:2gq74q25wxvtfd34zfknnalc/app.bsky.feed.post/3mdvmxxf2yc2thttps://bsky.app/profile/linseymarr.bsky.social/post/3mdqqsspnh22yMore on house burping: "...lüften is long established in Germany, where many landlords make tenants sign paperwork agreeing to air out their apartments for several minutes daily, if not multiple times per day, since mold removal often falls on the landlord." https://www.nytimes.com/2026/01/29/realestate/what-is-house-burping-luften.html?unlocked_article_code=1.IlA.fDf9.UR_Zmz-fFw20&smid=bs-share31 Jan 2026 21:22 +0000at://did:plc:2gq74q25wxvtfd34zfknnalc/app.bsky.feed.post/3mdqqsspnh22yhttps://bsky.app/profile/linseymarr.bsky.social/post/3mdqmkjfm3s27"House burping" is trending. Open your windows for a few minutes each day to ventilate the house, like a full-body cleanse for your indoor air. Pollutants from cooking and product use build up indoors, so it's good to flush if outdoor air quality is good. https://www.outsideonline.com/health/wellness/house-burping/31 Jan 2026 20:06 +0000at://did:plc:2gq74q25wxvtfd34zfknnalc/app.bsky.feed.post/3mdqmkjfm3s27https://bsky.app/profile/linseymarr.bsky.social/post/3mcbefulm722yWhaaat?! The EPA's cost-benefit analysis of air pollution regulations can only consider costs to businesses but not health benefits?! This is nonsense. GIFT ARTICLE: https://www.nytimes.com/2026/01/12/climate/trump-epa-air-pollution.html?unlocked_article_code=1.EFA.sfj4.F8ZBVbB2XiQ3&smid=bs-share13 Jan 2026 01:05 +0000at://did:plc:2gq74q25wxvtfd34zfknnalc/app.bsky.feed.post/3mcbefulm722yhttps://bsky.app/profile/linseymarr.bsky.social/post/3mbzanvymg222Here's an easy way to select a minimum clean air delivery rate (CADR) when you're shopping for a portable air cleaner (filter). For example, if my room is 15 ft x 12 ft = 180 sq ft, then I'd want a CADR of at least 120 CFM (cubic feet per minute). [contains quote post or other embedded content]09 Jan 2026 19:37 +0000at://did:plc:2gq74q25wxvtfd34zfknnalc/app.bsky.feed.post/3mbzanvymg222https://bsky.app/profile/linseymarr.bsky.social/post/3mbza4fwsek22Results from @donmilton.bsky.social's flu study now published. No transmission from naturally infected donors to recipients, possibly due to insufficient virus emitted by donors, low susceptibility of recipients, and rapid air mixing of breath plumes. https://dx.plos.org/10.1371/journal.ppat.101315309 Jan 2026 19:27 +0000at://did:plc:2gq74q25wxvtfd34zfknnalc/app.bsky.feed.post/3mbza4fwsek22https://bsky.app/profile/linseymarr.bsky.social/post/3mbrjody4bc2dHere's a story about detection of cetacean morbillivirus, in the same genus as measles virus, in whales' blowhole breath. I'm contemplating what we can learn by exploring transmission between animals. HT Julian Tang https://bbc.com/news/articles/cjdrpkj8111o06 Jan 2026 17:57 +0000at://did:plc:2gq74q25wxvtfd34zfknnalc/app.bsky.feed.post/3mbrjody4bc2dhttps://bsky.app/profile/linseymarr.bsky.social/post/3mayqvtew722zWhat a loss that @marinavance.bsky.social's EPA-funded research on wildfire smoke in homes has been canceled! I remain a proud academic mom. She did her PhD on exposure to engineered nanoparticles @virginiatech.bsky.social, right as my lab was shifting to study viruses in the air. [contains quote post or other embedded content]27 Dec 2025 21:30 +0000at://did:plc:2gq74q25wxvtfd34zfknnalc/app.bsky.feed.post/3mayqvtew722zhttps://bsky.app/profile/linseymarr.bsky.social/post/3ma7xgfyeak2eGift article about LA wildfires: "Visits to the emergency department rose 46% for heart attacks and 24% for pneumonia and other pulmonary illnesses compared with earlier years, the researchers reported." https://www.wsj.com/health/healthcare/heart-attacks-lung-conditions-jumped-after-los-angeles-wildfires-348ae7e8?st=JSYo2u&reflink=desktopwebshare_permalink18 Dec 2025 00:50 +0000at://did:plc:2gq74q25wxvtfd34zfknnalc/app.bsky.feed.post/3ma7xgfyeak2ehttps://bsky.app/profile/linseymarr.bsky.social/post/3m7gqe64mg22rFascinating outlook on similarities in aerosolization of microbes from the ocean surface and respiratory tract fluid by Dommer @rommieamaro.bsky.social @kprather.bsky.social [contains quote post or other embedded content]08 Dec 2025 00:07 +0000at://did:plc:2gq74q25wxvtfd34zfknnalc/app.bsky.feed.post/3m7gqe64mg22rhttps://bsky.app/profile/linseymarr.bsky.social/post/3m73w5mhk3k2tSix-week study of 67 students in four classes, 1047 saliva samples -> "Prolonged exposure in shared, poorly ventilated spaces, which potentially includes several infectious sources, drives respiratory virus transmission more than close contact." https://www.nature.com/articles/s41467-025-66719-3 HT: Emily Martin03 Dec 2025 16:51 +0000at://did:plc:2gq74q25wxvtfd34zfknnalc/app.bsky.feed.post/3m73w5mhk3k2t