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Just had a sample of the Eaton Fire ash that is in my driveway run on the department XRF. Is there titanium (new house paint)? Yup. Lead (old house paint)? You betcha. Heavy metals? Check. Treat that ash like it's toxic folks (because it is)

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All relatively low temperature combustion, like you'd see in a forest fire or grass fire, will be high in dioxin. They will be even higher in any wood that has been soaked in salt water, because of the chloride content. Salt water was used to put out many fires. 1/

Another step on the journey to explain to young firefighters why breathing apparatus and minimizing contact with PPE after a fire are SO important. House fire combustion products equals bad…

It’s scary, seem it too many times to count. I want to scream: Please, please, please take care of yourselves, you are our warriors, we need you healthy, it may not get you today but years from now it will. You will be a mentor to the next warrior, you are no good sick!

I’m so afraid Californians will suffer future illnesses, cancers like those caused by the smoke & debris from the Twin Towers 💔 Frightening to see people with no breathing protections standing amidst the rubble of completely destroyed homes It must be toxic. Please try to stay safe 🙏 Love from NYC

Any chance y'all at Caltech could help some of the folks whose houses are still standing do independent indoor ash testing? I know a lot of folks are worried about the transparency of insurance company contractors.

Amen! There are home test kits on the market. Are they just smoke and mirrors? "Smoke-mitigation" companies with insurance companies balk at requests for testing, sure their standard procedures will address all the toxins. But without before-and-after testing, how could they possibly know?

any recommendations for people who need independent testing done on ash in LA? that seems to be the #1 question from folks whose houses are still standing but contain soot—how do we have it analyzed to know whether our home and belongings are contaminated? most LA testing services focus on mold.

good question. Probably most of the ash is more or less the same composition. People are doing a broader study to check. But if it is ash I would assume it needs to leave the house. safely.

In XRF you are usually hearing the sample a ton to get it to fluoresce X-rays. When done in the atmosphere this typically oxidizes anything in the sample that wasn’t already bonded with oxygen. All iron commonly is assumed to become iron (III) by the end, for example.

What company are you using? Last week, two ServiceMaster reps came to my house--across N Altadena Dr from leveled houses and the gutted Jewish Temple--without masks! I see unmasked ServPro reps on my block now. PuroClean? "Green Planet"? (I'm not fooled by a name, but I appreciate the gesture.)

Lead dust particles can range in size from .1 - .7 microns. N95s filter 95% of particles .3 microns and larger, but smaller than .3 it’s not going to filter enough to be considered protection. Here’s what masks Niosh recommends for lead dust: www.cdc.gov/niosh/npg/np...

cdc.govCDC - NIOSH Pocket Guide to Chemical Hazards - Lead Centers for Disease Control and Prevention. CDC twenty four seven. Saving Lives, Protecting PeopleMinushomeexpandexpandLead metal, Plumbum A heavy, ductile, soft, gray solid.

A friend worked in NYC near Ground Zero. He died in his early 50's from an extremely aggressive cancer from exposure to toxic airborne materials. LA residents will see an increase in cardiac, lung & cancers from exposure to toxic air & soil. My heart goes out to everyone impacted by the fires.

Suggestion: Hemp plants remediate heavy metals out of soils really well, grow incredibly fast, require not much water, sequester carbon and have sturdy root systems that stabilize slopes. Y'all ought to consider growing the stuff in your yards for a few years. Also-hempcrete for rebuilding!

out of curiosity where was the sample taken neighborhoodwise in relation to the fire having a hard time letting my toddler touch basically anything and I'm down in South LA

The public should be warned. Protect small children and pregnant women particularly. Anyone doing cleanup should be masked. The use of leaf blowers should be immediately banned. There’s a lot of info from Fukushima on phytoremediation but it’s not easy or cheap.

Many toxic substances can be absorbed directly through your skin, including many toxic metals like lead, so it’s NOT enough to wear masks. During clean-ups, it’s also important to wear chemical-proof gloves, arm gauntlets, & other covers you can shed & keep separate from your life & family.

Might be a good idea for local governments or neighborhood associations to invest in several hand-held XRF analyzers, to spot-check and double-check the toxic metal & other contamination levels in each property owner’s individual home & yard soil. Just touch it to a sample to know the toxicity.

Please double-check whatever you’re told by state & fed enviro agencies. Do some independent tests & research for “second opinions.” Enviro agencies OFTEN give in to huge political pressure to cut corners. They often give false public assurances that a halfway cleanup is “safe enough.” Beware.

I’m so sorry. Those lead & arsenic levels are especially high. Once the primary clean-up is done, it could be worthwhile doing “phyto-remediation.” (Grow specific plants to extract toxins from soil, then pull up & dispose of plants).

Can you confirm if this is correct: "EPA’s standard for lead in bare soil in play areas is 400 parts per million (ppm) by weight and 1200 ppm for non-play areas." (several online web pages). One did say the EPA recently lowered the "play area" level to 200 ppm. I suppose less is better.

30m from an Eaton fire location makes the plan for 6 inches down worthwhile bc I heard, this particular area hasn't burned since being inhabited. In Palisades, a control sample should be more like from 6ft under. Bc I think it burned at least once since ubiquitous use of modern materials/toxins.🤔

Most of the fires that have burned nearby in recent past have been predominantly wildland fires. Not thousands of homes plus paint stores, gas stations, industrial businesses. Would be different composition. But the fireworks residue seems like it has been a constant for ever.

I’ve got a bucket of water in the driveway that I wash my car windows off with last Wednesday morning that I still haven’t dumped. That was the most ash heavy night from Eaton. Do you want that? Lol, it could be procrastination for science.

If it's strontium 88, naturally occuring, old TVs. If it's strontium 90, soviet era RTGs, nuclear testing. We're about 4 half-lives from the latter, which would also explain some of the Yttrium (not much, short half life) and zirconium. @funranium.bsky.social can say better than I.

From Wikipedia: “At the peak of production of television cathode-ray tubes, as much as 75% of strontium consumption in the United States was used for the faceplate glass.[9] With the replacement of cathode-ray tubes with other display methods, consumption of strontium has dramatically declined.” ???

If I may add: Al, Si, Zr, Mg: Probably silicates from soil material Ca, K: Wood ash, maybe also soil material (silicates and carbonates) Ti: May be from soil, but also used in whitener in e.g. paint, sunscreen, toothpaste. The rest: maybe from soil, road dust,etc. but poss. also from burnt stuff.

Colorant in fireworks and flares, and according to the Royal Society of Chemistry, 'glow in the dark paints and plastics', which, given my wife's recent purchase and deployment of said paint for her crafts, makes me say ... hmmm. I suppose most of it isn't the radioactive isotope.

Burning cars & tires? We detected strontium, arsenic, boron, barium, antimony, etc, in ash on our garden & fruit trees after a huge & horrible auto junkyard fire a quarter mile from our home in 2015. Found LOTS of online tech articles about such contaminants. Try “ToxNet” at National Library.

I make ceramics, strontium is used in some glazes. So is titanium, rutile (unrefined tiranium), cobalt, lithium in crystal glazes etc.

Silicosis is one thing, but I only mix glazes from dry ingredients outside while also wearing a respirator. Another one that’s very dangerous, especially fumes from firing, is manganese dioxide

Most older houses have lead paint and asbestos in the sheetrock and it's considered okay so long as it's stable. Fixing that would be in my case) well over $100k to fix. Just the floor and partial walls in the kitchen after the fire was $20k.

I live in Whittier and still haven’t gone on walks or done any outside activities because I’ve heard about the toxins and how far they travel. With what looks to be a drought year staring us in the face I don’t know when the reprieve will come and am ♾️ thankful to the smart folks figuring it out!

My neighbor was using his blower even after I told him it was toxic and that blowers were banned. It's scary to know how much more of this was drifting into our house because of him than already was.

The only commercial use I could find of Rb is as a colorant in fireworks. Otherwise it's not used much outside of research settings that I could find.

I don't have a sense about levels and hazard, but looking at epa trigger levels for action they are 400ppm for soil lead. Dust levels seem like they ought to be lower and are 5 ug/ft2 post abatement. It looks like you're measuring 200ppm but I'm not sure how that maps to dust amount

EPA residential is now 200 PPM for lead, 100 if vulnerable populations are present. 400 PPM was the old standard, and is used to trigger time critical removal actions, not for long-term exposure.

Thanks! That's really helpful. Do you know how the ug/ft2 levels map to something more intuitive? It's for lead paint dust which is going to be way way higher ppm than the ash, so I'm not sure it's a really direct comparison but seems like a decent start?

Hm. Unfortunately no, not off the top of my head. I don't deal with lead paint directly - my program specifically excludes it when we do evaluations for yard cleanups - but Im sure there's a mathmatical conversion possible if you dig into the data.

Hi. Would you be able to share your very approximate location, and also if you know if they tested for furans/dioxins/pcbs? Jane Williams says those are the ones that can’t be remediated. Are you planning to do water testing also? Good luck with all this.

In north county San Diego we’ve been struggling with poor air quality even with filters running. I can’t imagine how intolerable it must be closer. Be careful neighbors!