#400ppm

[johniac]

SciTech Chronicles. . . . . . . . .Feb 5th, 2025

[robustcornhusk]

364.0 ppm

yeah, i don't think so, old co2 monitor

[pavlikbuonarroti]

if you ever considered dissolving instant coffee under your tongue for a quick energy boost id definitely recommend kenco over nestle. much more pleasant experience.

[river-taxbird]

I really like my CO2 meter and I want to tell you about it!

It's a little gadget that measures the amount of carbon dioxide in the air. Did you know your body at rest burns about 100 grams of food/fat an hour? This means you're constantly breathing out carbon dioxide at a rate of about 100 grams an hour. This can rise by quite a lot of you're exercising, and it's less when you're sleeping. This means if you usually keep your doors and windows closed, as I usually do in winter since I live in a cold climate, it can build up fast. You can even breathe directly on the meter and watch the number rise rapidly.

I've had this meter on my desk for many years. It's basically a clock so you can notice the air quality at a glance and it's always on and doesn't produce light. (Note the black tape over the power LED on the left because my autistic ass can NOT sleep with an LED in the room.) It cost about £90 when it was new so it's not the cheapest thing in the world but it's built to last and it's been worth it. This isn't an ad and I'm not saying go for this brand, it's just a gadget that I think improves my life. It's always a good reminder of when I should open the windows.

I'm not 100% sure how well supported this is, but I've seen it said online that a carbon dioxide level of over 1000ppm can lower a person's cognitive function by about 25%. It can be an issue with classrooms with a lot of people. Normal outdoor levels are about 300-400ppm. Whether you believe that is up to you, but I do think fresh air makes people feel better and this serves as a good reminder to let it in. People like to make carbon monoxide jokes on this website, but sometimes high CO2 can be an issue around his you generally feel. It can also build up faster than you'd think if you have multiple people about and no windows open.

Time to open the window! (Apologies for the photo quality, the reflective LCD is not the easiest thing in the world to photograph without shadows or huge reflections.)

[reportsofawartime]

地球大気中の二酸化炭素（CO2）排出が「地球温暖化」を引き起こすことはあり得ないことを証明する決定的な科学的証拠が、査読を受けた新しい研究によってもたらされた ヤン・クビッキ博士は、世界的に有名なポーランドの科学者グループを率いて、CO2排出量の増加が地球の気温に与える影響を研究した しかし、CO2濃度が高くても違いがないことがわかっただけでなく、二酸化炭素の増加によって気温が上昇することはありえないことも証明された クビッキと彼のチームは最近3つの論文を発表したが、そのどれもが地球の大気はすでに二酸化炭素で飽和していると結論づけている この飽和状態とは、CO2レベルが大幅に上昇しても、温室効果ガスが気温上昇を引き起こさないことを意味する クビッキらは、飽和の結果として、排出されたCO2が地球の温度上昇を直接引き起こすことはないと指摘し、その証拠を要約している 現在の大気中の二酸化炭素濃度はおよそ418ppmだが、400ppmを超えると、二酸化炭素濃度はもはや気温上昇を引き起こさないと科学者たちは述べている

[dragonanarchist1155]

Mfw the water hardness where I live is harder. (400ppm, El Bosque - Santiago)

The lowest in the city is 210ppm, in the high class neighborhoods, mean is 450ppm in Santiago de Chile.

It's still drinkable, but most water filters will go bust in these conditions lmao. We also have to clean our kettles and keep watch on our hot water appliances for blockages.

Water lore‼️‼️

[munirayusuf]

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[davidbookstaber]

How much CO2 does a gas stove add to indoor air?

CO₂ meter next to gas stove boiling water For fun I got a carbon dioxide (CO₂) meter. Standard atmosphere contains 400ppm of CO₂. Some studies suggest that mental performance begins to degrade when CO₂ concentration exceeds 1000ppm. I was surprised to see that when cooking on my gas stove (in the kitchen) the CO₂ meter in my office began to register levels approaching 2000ppm. I was curious to…

[ghostsarecool]

it bothers me when covid cautious people say “surgical masks are useless only wear n95s!” bc its just not factually true that surgical masks “do nothing” and if that’s the only mask you have access to it’s better than not masking and i feel like that should be made clear so that people don’t just not mask bc they don’t have or can’t afford n95 masks ?? also in certain scenarios it may make more sense like i wear a surgical mask at work in the summer bc it’s not air conditioned and the CO2 level is consistently right around 400ppm ie = to outside CO2 concentrations indicating it’s very well ventilated therefore between the relatively lower risk and the risk of overheating in an n95 (i’m on 2 medications that can increase heat sensitivity and it’s a major migraine trigger for me) i go with the surgical mask ! also some people do have legitimate medical reasons they cannot mask so it’s annoying to be like “i wore an n95 for a hot pilates class and i was fine so you can wear an n95 in any circumstance too!!” like ur hour long hot pilates class is not equivalent to my 3-6 hr work shift in 95-100 degree heat and often high humidity and maybe you don’t have the same medical risks around heat that i do etc

[rebbelsinchad]

C02 is plant food, our atmosphere is at about 400ppm right now. Indoor grow facilities found that plants produce a substantial increase of harvest when the C02 is at 1200 ppm. Global temperatures have fallen in the past 30 years. Where was i going with this

[trolltitan]

Climate change is a natural cycle. Humans aren't responsible for it, and there's no need for drastic measures ⊙_☉ also the face I make when plants need carbon, we need plants, and it is only 350-400PPM of the atmosphere, and if it drops to 150-250 plants start dying. ( ͡° ͜ʖ ͡°)

-----------------_=👑 Troll King Says Peace Out! 🎤=_-----------------

[robustcornhusk]

just got a co2 sensor for our bedroom a few days ago.

the first big jump is when i was caramelizing onions yesterday afternoon; the second when i was cooking soup; and the last jump at midnight was when we went to bed.

surprised that it drops to 800ppm during sleep! i expected it would increase all night.

(the 400ppm reading around noon yesterday is probably off a bit but not too much; some windows were open)

[disease]

400PPM // 8.069 [FIT FOR PURPOSE, 2017]

[luulapants]

Yeah, as someone who does lead testing professionally, her website does NOT inspire confidence. She states that she’s testing these with an XRF gun, which would cost about $30,000 to purchase outright for a decent one. You do need to be professionally trained to calibrate them AND need to regularly send them out for maintenance.

On top of that, right on the first page she has this:

A) 500ppm is a typical detection limit for an XRF gun which means it would be unlikely to detect as low as 90ppm. Given that she provides an uncertainty range of +/- 400ppm, I’m thinking that’s the absolute minimum she can reliably report.

B) Below 90ppm is NOT safe for kids - there is no safe level of lead exposure for children. There is no drop-off point after which lead exposure becomes safe. Every bit of lead a child is exposed to decreases academic and intellectual performance and increases the likelihood of emotional and social problems.

C) She states that she scans on the decorative edge, where she believes the lead content to be. This is incorrect XRF scanning protocol. The XRF gun is meant to measure single materials and measuring a paint or coating on top of another material won’t give you an accurate read.

To top it off, XRF guns measure lead content, which is not the same as lead leaching. She states on her website:

None of this is right. Leach testing is far more rigorous than XRF testing. When XRF scanning is chosen over leach testing, it’s usually because it’s less expensive (a few hundred dollars per material to scan for a few heavy metals vs. tens of thousands of dollars to run several analysis scans determined by disclosed product ingredients). This difference in rigor is especially true for lead, which has a relatively high detection limit in XRF. You can get much more accurate information about lead risk from a leaching test, which goes into the parts per billion rather than million, than you can from XRF.

Also, leaching typically decreases over time as the surface of the product is conditioned by regular washing which basically removes any contaminants which were held loosely enough on the surface that they could be extracted. Rinsing a product prior to leach testing decreases the likelihood of leaching. 100% of the time. The more you rinse or wash the product, the better it does on a leaching test. The only reason leaching might become worse over time is if a coating chipped, exposing a new material underneath, but thankfully plates tend to chip on the edges, not the part that the food touches. If it chips in the middle, you probably don’t want to use it anyway because you could get glass shards in your food.

Finally, while I do feel for this woman’s story, it’s critical to note that her children experienced acute lead poisoning, which is different from lead exposure that someone would get from eating off a leaded plate, and I don’t feel that she adequately refrains from fearmongering by conflating one with the other. Acute lead poisoning is most typical in the trades, where a person might be exposed to aerosolized lead paint when sanding (it sounds like her child was in the house while something like this occurred). It leads to immediate and catastrophic health effects that must be treated with kelation therapy. Lead exposure happens much more slowly and creates long-term health issues that may be difficult to directly attribute to lead in an individual, but which scientists have correlated pretty definitively in population studies. Lead deposits in all parts of the body and especially in bones and teeth where it has a half-life of 20 years. However, rather than sudden-onset brain damage like this woman’s child experienced, you really wouldn’t be able to tell how profoundly lead exposure impacted a single child because you don’t know what their health outcomes would have been in its absence.

Anyway, yes, this is not a reliable source.

[tumbloar]

400PPM - Into The Heap