Aurel Wünsch

@aurel.indoorco2map.com

2337 Followers 752 Following

Hier privat zu Energie | Emissionen | Digitalisierung | Covid | Arbeitet bei der Prognos AG | In my free time I work on http://indoorco2map.com (there is also a discord server for it: https://discord.gg/9FqE7wna4D )

screenshot of the new Post screen of myself which shows its set to english

Diagramm, dass die Wärmepumpenverkäuft in Norwegen, Finland und Schweden zeigt. Über 75% der verkauften Anlagen in den Letzten Jahren sind Luft-Luft-Wärmepumpen

Image of a multi-appartement home with 3 stories x 5 windows visible and there is an AC or Air-to-Air-Heatpump in every one of them.

Stacked bar chart of indoor CO₂ distribution by GO IAQS air quality category. Bars show % of locations in each category per group, sorted best to worst. Data: 3.587 locations · 9.154 visits shown · 14 location types (most frequently measured). Filters: Germany; all location types; Apr 11, 2024–Jul 2, 2026. doityourself: Good 92.4%, Moderate 7.6%, Unhealthy 0.0%. clothes: Good 85.0%, Moderate 11.9%, Unhealthy 3.1%. fast_food: Good 82.6%, Moderate 15.1%, Unhealthy 2.3%. furniture: Good 82.4%, Moderate 17.6%, Unhealthy 0.0%. mall: Good 79.6%, Moderate 19.4%, Unhealthy 1.0%. pharmacy: Good 74.7%, Moderate 24.1%, Unhealthy 1.1%. museum: Good 72.5%, Moderate 20.9%, Unhealthy 6.6%. bakery: Good 70.1%, Moderate 27.8%, Unhealthy 2.1%. chemist: Good 58.2%, Moderate 38.4%, Unhealthy 3.4%. cinema: Good 55.8%, Moderate 32.6%, Unhealthy 11.6%. cafe: Good 54.6%, Moderate 31.9%, Unhealthy 13.5%. restaurant: Good 51.7%, Moderate 34.0%, Unhealthy 14.3%. doctors: Good 34.7%, Moderate 49.4%, Unhealthy 15.9%. supermarket: Good 31.0%, Moderate 57.3%, Unhealthy 11.7%.

Histogram of indoor CO₂ distribution (location count per CO₂ bin, bin size: 200 ppm). Filters: Germany; Libraries; Apr 11, 2024–Jun 7, 2026. Data: 53 locations · 116 visits. 400–600 ppm: 14 locations; 600–800 ppm: 25 locations; 800–1000 ppm: 6 locations; 1000–1200 ppm: 4 locations; 1200–1400 ppm: 3 locations; 1400–1600 ppm: 0 locations; 1600–1800 ppm: 1 location; 1800–2000 ppm: 0 locations; 2000–2200 ppm: 0 locations; 2200–2400 ppm: 0 locations; 2400–2600 ppm: 0 locations; 2600–2800 ppm: 0 locations; 2800–3000 ppm: 0 locations; 3000+ ppm: 0 locations.

Stacked bar chart of indoor CO₂ distribution by GO IAQS air quality category. Bars show % of locations in each category per group, sorted best to worst. Data: 6.427 locations · 14.249 visits shown · 15 location types (most frequently measured). Filters: all countries; all location types; Apr 11, 2024–May 24, 2026. doityourself: Good 93.4%, Moderate 6.6%, Unhealthy 0.0%. fast_food: Good 81.4%, Moderate 16.5%, Unhealthy 2.0%. clothes: Good 79.7%, Moderate 18.4%, Unhealthy 1.9%. mall: Good 75.5%, Moderate 23.6%, Unhealthy 0.9%. pharmacy: Good 71.5%, Moderate 26.1%, Unhealthy 2.4%. museum: Good 70.3%, Moderate 25.3%, Unhealthy 4.4%. convenience: Good 69.9%, Moderate 26.4%, Unhealthy 3.7%. bakery: Good 68.7%, Moderate 27.9%, Unhealthy 3.4%. Other: Good 67.2%, Moderate 29.0%, Unhealthy 3.8%. chemist: Good 60.4%, Moderate 36.6%, Unhealthy 3.0%. hotel: Good 60.2%, Moderate 35.2%, Unhealthy 4.5%. restaurant: Good 58.1%, Moderate 32.0%, Unhealthy 9.9%. cafe: Good 57.8%, Moderate 33.1%, Unhealthy 9.1%. supermarket: Good 36.2%, Moderate 54.6%, Unhealthy 9.2%. doctors: Good 31.9%, Moderate 53.1%, Unhealthy 15.0%.

screenshot of the copyright and licensing page which has the following suggested citation: Suggested citation. Infection prevention and control guideline for Ebola and Marburg diseases. Geneva: World Health
Organization; 2025. Licence: CC BY-NC-SA 3.0 IGO.

A photo of the panel at the World Health Assembly High-Level dialogue on Healthy Indoor Air which shows a large display with various Indoor Air Quality parameters of the room. CO2 is at 471ppm

Announcement Poster of the Hig-Level Dialogue on Healthy Indoor Air - a side event of the World Health Assembly in Geneva

Box plot comparing indoor CO₂ levels (ppm) by location type — 30 groups. Filters: all countries; all location types; Apr 11, 2024–May 13, 2026. Data: 4.420 locations · 11.116 visits shown · 30 location types (highest median CO₂). Groups with lowest CO₂: pub (n=62): median 1,241 ppm, Q1 814 ppm, Q3 1,912 ppm, IQR 1,098 ppm; whiskers 535 ppm–3,371 ppm; 4 outliers, highest 7,114 ppm. nightclub (n=12): median 1,208 ppm, Q1 833 ppm, Q3 1,890 ppm, IQR 1,057 ppm; whiskers 494 ppm–2,162 ppm; 2 outliers, highest 7,648 ppm. veterinary (n=18): median 1,046 ppm, Q1 842 ppm, Q3 1,279 ppm, IQR 437 ppm; whiskers 614 ppm–1,865 ppm; 3 outliers, highest 2,148 ppm. Groups with highest CO₂: aerodrome (n=13): median 747 ppm, Q1 609 ppm, Q3 846 ppm, IQR 237 ppm; whiskers 520 ppm–1,078 ppm; no outliers. centre (n=14): median 746 ppm, Q1 627 ppm, Q3 944 ppm, IQR 317 ppm; whiskers 504 ppm–1,354 ppm; 1 outlier, highest 2,179 ppm. clinic (n=56): median 744 ppm, Q1 661 ppm, Q3 893 ppm, IQR 233 ppm; whiskers 510 ppm–1,106 ppm; 3 outliers, highest 1,487 ppm. The 24 middle groups — doctors, conference_centre, college, supermarket, physiotherapist, place_of_worship, wholesale, theatre, government, community_centre, sports_centre, variety_store, confectionery, school, bar, charity, hairdresser, terminal, arts_centre, cinema, social_facility, chemist, dentist, gift — have medians between 747 ppm and 945 ppm; whiskers 394 ppm–2,613 ppm; 191 outliers combined. The IQR (interquartile range) spans from Q1 (25th percentile) to Q3 (75th percentile), covering the middle 50% of values; a smaller IQR indicates a more consistent distribution.

Screenshot of the final paragraph of the text linked in the Article from the post by Donald Miltion with the following text: WHO’s default recommendations for severe pathogens with respiratory transmission potential should begin from a precautionary airborne-risk framework — including respirators, ventilation optimisation, and portable HEPA filtration — and only be relaxed if evidence later demonstrates that such measures are unnecessary. The costs of implementing these protections early are modest; the costs of delaying them during a high-consequence outbreak may be profound.

Meme image of the aristocratic toad template with the text:
Gentlemen, it is with great regret to inform you, That there are published Papers about this

Histogram of indoor CO₂ distribution (percentage of locations per CO₂ bin, bin size: 400 ppm). Filters: Germany; Doctor's Offices; Apr 11, 2024–May 5, 2026. Data: 164 locations · 353 visits. Peak bin: 800–1200 ppm at 40.9%. 18% between 1200 and 1600ppm, 6% between 1600 and 2000% ppm. 4% higher than 2000ppm

The first victim was a 70-year-old man who died on the ship and whose body was removed in the British territory of Saint Helena in the South Atlantic, South Africa's Health Department said in a statement. The man's wife collapsed at an airport in South Africa trying to take a flight to her home country of the Netherlands, the department said. She died at a nearby hospital.

screenshot of text excerpt of the linked article: The department identified the patient in intensive care in a hospital in Johannesburg as a British national. It said that person fell ill near Ascension Island, another remote island in the Atlantic, after the ship left Saint Helena and was transferred from there to South Africa.

Image of the tool which generates social media ready graphics. there are 3 layout options (landscape, square, portrait mode). There is a option to generate ALT-Text and copy it to the clipboard. The alt text describing the chart is the following: Box plot comparing indoor CO₂ levels (ppm) by time period in Doctor's Offices — 12 groups. Filters: all countries; Doctor's Offices; Apr 11, 2024–Apr 29, 2026. Data: 380 locations · 468 visits shown · 12 periods. Groups with lowest CO₂: Jan (n=47): median 1,005 ppm, Q1 875 ppm, Q3 1,457 ppm, IQR 582 ppm; whiskers 616–2,307 ppm; 2 outliers, highest 3,287 ppm. Feb (n=39): median 1,096 ppm, Q1 985 ppm, Q3 1,446 ppm, IQR 461 ppm; whiskers 616–1,937 ppm; 2 outliers, highest 2,360 ppm. Mar (n=35): median 996 ppm, Q1 821 ppm, Q3 1,173 ppm, IQR 352 ppm; whiskers 565–1,583 ppm; 2 outliers, highest 3,880 ppm. Groups with highest CO₂: Oct (n=49): median 1,077 ppm, Q1 778 ppm, Q3 1,406 ppm, IQR 628 ppm; whiskers 513–2,149 ppm; 2 outliers, highest 3,312 ppm. Nov (n=62): median 1,083 ppm, Q1 862 ppm, Q3 1,498 ppm, IQR 636 ppm; whiskers 576–2,331 ppm; 2 outliers, highest 2,826 ppm. Dec (n=43): median 1,046 ppm, Q1 819 ppm, Q3 1,241 ppm, IQR 422 ppm; whiskers 566–1,828 ppm; 2 outliers, highest 2,348 ppm. The 6 middle groups — Apr, May, Jun, Jul, Aug, Sep — have medians between 665 and 942 ppm; whiskers 473–1,798 ppm; 6 outliers combined. The IQR (interquartile range) spans from Q1 (25th percentile) to Q3 (75th percentile), covering the middle 50% of values; a smaller IQR indicates a more consistent distribution.

Comparison of CO2 levels for LIDL supermarkets across multiple countries. Note that switzerland and france have a very low samples size of 6 and 4 and this is chart is more for illustrative purposes of what's possible.
Germany LIDLs (n=179) have 1221ppm in median, Austria (n=28) have 1094, Switzerland has 859 and France 768

Comparison of german supermarkets between weekdays with CO2 levels of 936ppm median and saturday with 1009ppm

Comparison of german supermarkets between summer half-year with CO2 levels of 896ppm median and winter half-year with 963ppm

Boxplot comparing CO₂ levels (in ppm) measured in supermarkets across 10 countries, sorted by highest median CO₂. Data from IndoorCO2Map covers 2,376 locations and 6,976 visits.
Median CO₂ values per country:

Netherlands (n=40): 961 ppm
Germany (n=1,601): 941 ppm
Austria (n=267): 932 ppm
Switzerland (n=61): 854 ppm
United Kingdom (n=65): 782 ppm
France (n=57): 776 ppm
United States (n=108): 768 ppm
Italy (n=29): 695 ppm
Sweden (n=24): 669 ppm
Spain (n=34): 648 ppm

Germany has the largest sample and the most outliers, with extreme values reaching nearly 3,000 ppm. Most countries show typical ranges between roughly 500 and 1,500 ppm. Southern European countries (Italy, Spain) and Sweden show the lowest medians, while Central European countries cluster at the top.

A screenshot of the new data explorer website with a boxplot showing the 20 most measured types of locations sorted by median CO2-levels in descending order. worst 5 are: Doctors at 945ppm, supermarkets at 895ppm, theatres at 864, cinemas at 766ppm and chemists at 749ppm. best 5 are bakerys at 672ppm, furniture shops at 648ppm, clothes shops at 633ppm, fast food stores at 630ppm and do-it-yourself shops (hardware stores) at 576ppm

Image of the history screen which shows all recordings you did yourself. it displays them in a chart and ther also is a an option to show it on the map and a grouping option and search filter.

A screenshot of the app showing the selected tram route on a map

A screenshot of the new main menu of the app, showing a sensor selection dropdown, the possibility to search for buildings and public transit in vicinity. sorting by distance or alphabet, a text search and the option to start the recording

Folie vom BDEW mit folgendem text: Methodische Erläuterungen zum Strompreisdurchschnitt
Haushalte
Der Preisdurchschnitt enthält Tarifprodukte und Grundversorgungstarife, welche zum Berechnungszeitpunkt abschließbar
waren. Diese werden mit der Vertragsstruktur gemäß Angabe der Bundesnetzagentur gewichtet (2024: 78% Tarifprodukte, 22%
Grundversorgungstarife). Zudem erfolgt eine Durchschnittsberechnung der Strompreise auf Gemeindeebene mit
anschließender Gewichtung anhand der Anzahl der Einwohner.
Der ermittelte Preis bildet nicht den Preisdurchschnitt der bestehenden Vertragsverhältnisse bzw. Absatzmengen ab, d. h. es
erfolgt auch keine Mengengewichtung. Der Grundpreis ist im Preis in ct/kWh für einen Jahresverbrauch von 3.500 kWh anteilig
enthalten. Sondertarife wie spezielle Ökostromtarife mit Aufschlag, Heizstromtarife, Wärmepumpentarife, Koppeltarife
mit anderen Produkten (z. B. Gas, Telekommunikation) o. ä. sind nicht berücksichtigt.

Excerpt of Aranet Datasheet with the following text: CO2 sensor of the device is calibrated at standard atmospheric pressure. CO2 readings are pressure compensated
and comply with the specifications down to 750 hPa. If the device has to be used at high altitude for a prolonged
period of time, manual calibration of the unit should be performed for optimal performance. It is not intended to use
the device higher than 4000 m (13’000 ft) above the sea level.

URL: https://assets.aranet.com/documents/Aranet_Datasheet_TDSPC0H3_Aranet4_HOME_1.pdf

Map of the IndoorCO2map Project with the filter to only show cafés enabled, map is showing large parts of europe with measurements mostly in german speaking countries and the UK. Roughly the same amount of locations with Good and Moderate Air Quality according to the GO AQS Standard and a few locations with Unhealthy Air Quality

A three-panel comic from xkcd by Randall Munroe titled “How Standards Proliferate (see: A/C chargers, character encodings, instant messaging, etc.).”

Panel 1: A caption reads, “Situation: There are 14 competing standards.”

Panel 2: Two stick figures talk. One says, “14?! Ridiculous! We need to develop one universal standard that covers everyone’s use cases.” The other responds, “Yeah!”

Panel 3: A caption reads, “Soon: Situation: There are 15 competing standards.”

Screenshot of the indoorCO2Map showing Los Angeles to San Francisco and surroundings with the filter set to only display location with Good Air Quality according to GO IAQS CO2-scores

Screenshot of the website showing Europe with thousands of map markers in the 3-color Scheme used by the GO IAQS Standard

Diagramm einer Messung im 100 Club in London mit einem Durchschnitt von 7648 ppm und Spitzenwerfen von fast 12000ppm

Text of the endangerement finding: On December 7, 2009, the Administrator signed two distinct findings regarding greenhouse gases under section 202(a) of the Clean Air Act:

Endangerment Finding: The Administrator finds that the current and projected concentrations of the six key well-mixed greenhouse gases—carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), hydrofluorocarbons (HFCs), perfluorocarbons (PFCs), and sulfur hexafluoride (SF6)—in the atmosphere threaten the public health and welfare of current and future generations.
Cause or Contribute Finding: The Administrator finds that the combined emissions of these well-mixed greenhouse gases from new motor vehicles and new motor vehicle engines contribute to the greenhouse gas pollution that threatens public health and welfare.

Boxplot-Chart showing CO2-levels for different types of locations measured in the indoorCO2map.com citizen science project. Doctors offices are the 3rd worst category (just pubs and community centers have higher median values). These measurements are mostly taken in germany so far so might not be generalisable and they are measurements both in waiting rooms and also treatment rooms

Screenshot of an X post with embedded video with text: Chicago ICE Chief Greg Bovino tells
@HARRISFAULKNER
he’ll meet with a federal judge every day - and says she’ll see “firsthand how bad things really are.”

What’s your reaction?

Screenshot of the indoorco2map. Showing many hundred pins in Vienna denoting one of multiple measurements in a different Location

Chart showing the median value of recodings in different modest of public transit. The order is from lowest to highest: Tram, Lightrail, Subway, Bus, Monorail, Trains. Median Value of Trams is around 700ppm, that of trains around 1000ppm. Trains also have the largest variance of the recorded values.

Chart C.1.2.4 of ImpAQS – Final Report von McLeod, Hopfe et al. excerpt from the summary describing the main point of the chart: "For
example, when the outside air temperatures are 10 °C or below, mechanically ventilated classrooms
have on average 450–600 ppm lower daily mean CO2 concentrations than naturally ventilated
schools. )". It also shows a large seasonal variation of the values, with the summer being significantly worse.

Average CO2 levesl by meteorological Week of the year. While supermarkets have very small seasonal variation, some categories like Fastfood are ~200ppm lower in the summer (600) than the winter (800). Similar for Chemists, also around 200ppm difference. Restaurant even have a larger variance but suffer from small sample size and selection bias.

Box-Plot of the results for many different categories, most important qualitative findings described in the thread.

Screenshot der S3-Leitlinie
Maßnahmen zur Prävention und Kontrolle
der SARS-CoV-2-Übertragung in Schulen | Lebende Leitlinie
WHO-Integrate Framework mit folgendem Text:

Empfehlung 8
Lüften und Reduktion der Aerosolkonzentration in Unterrichtsräumen
……………………………………………………………………………………………………………………………………………………………………………………………………………
Empfehlung 8.1
Es soll regelmäßig und ausreichend gelüftet werden. Der Betrieb einer geeigneten Lüftungs- oder Raumlufttechnischen Anlage ist als
gleichwertig anzusehen. CO2-Ampeln können als Indikator für die Luftgüte erwogen werden.
Art der Empfehlung
Evidenzbasierte Entscheidung
Konsensbasierte Entscheidung
Empfehlungsgrad
Starke Empfehlung (Empfehlungsgrad A; Formulierung soll / soll nicht)
Empfehlung (Empfehlungsgrad B, Formulierung sollte / sollte nicht)
Offene Empfehlung (Empfehlungsgrad 0; Formulierung kann erwogen werden / kann verzichtet werden)
Literatur
Bershteyn et al. (2020); Exner et al. (2020); Hoover et al. (2021); Landeros et al. (2021); Littlecott et al. (Forthcoming); Noorimotlagh
et al. (2021)

Chart C.1.2.4 des ImpAQS – Final Report von McLeod, Hopfe et al. in dem sichtbar wird dass Schulen mit mechanischer Lüftung deutlich niedrigere CO2-Werte im Mittel haben als Schulen mit natürlicher Lüftung. bei 10°C oder weniger laut Zusammenfassung 450-600ppm weniger: For
example, when the outside air temperatures are 10 °C or below, mechanically ventilated classrooms
have on average 450–600 ppm lower daily mean CO2 concentrations than naturally ventilated
schools. )

Darstellung der pro Kopf Ausgaben für das Gesundheitswesen in 2023. Dänemark, Deutschland, Niederlande, Österreich, Schweden, Irland sind alle mit geringfügigen Unterschieden bei 6000€ pro Kopf.

Impfquote Corona Ü60 2024/2025

Schematic drawing of the railcar type Preußischer AT7 with a battery tender.

Chart with the Result of the Wells-Riley-Model. Title: IRP Count over time in a 100m³ room using decay profiles of Delta Variant from Haddrell et al. (2024) for 500ppm CO2 and 3000ppm CO2 at different Ventilation Rates. Assuming a Room with 4 people the 120l/s result in roughly 550ppm and 10l/s in 1800ppm* . The Chart shows the highest Value for a Ventilation Rate of 10/l s with the slow decay rate the virus had at 3000ppm. If counterfactually the decay rate would stay the same with 120l/s ventilation at 550ppm it would reduce the particle count by a factor of 2,5. Using the measured faster decay rate at the lower CO2 value of 550pm there is a reduction by a factor of 5. There is also an infobox with following text: There is only Data for 1800ppm at 120 seconds after emission instead many datapoints as for 3000ppm but as the decay is the roughly the same at that point as 3000ppm I use 1800ppm as example using the 3000ppm decay values here. There also is no Data for 550ppm but as thats really close to 500ppm I use the 500ppm Value as using 3000ppm vs 500ppm would be a very extreme difference in Ventilation rates - more finegrained Data would make this more exact, but this is mostly about the principle anways.

A Linechart showing the Equilibrium Amount of viable infectious particles for 2 theoretical viruses depending on different Ventilation Rates from 0 to 100 l/s in a 100m³ room. Virus A emits 1000 particles per second and has a half-life of 30 minutes. Virus B emits 2000 particles a second and has a half-life of 10 minutes. At low Ventilation rates Virus A has a higher Equlibrium particle count, at high ventilation, Virus B has a higher one.

The Title and Subtitle of the chart is: Changes in Ventilation makes a bigger difference the slower a Virus decays
(Important: to demonstrate the general effect the decay rate here is assumed to be constant but the decay rate itself can be effected by ventilation because of changing CO2-Levels , Humidity etc - this varies between Viruses and exact conditions) [Values shown based on a simple Wells-Riley-Model-Implementation]

Screenshot der Destatis Definition von Migrationshintergrund: Eine Person hat einen Migrationshintergrund, wenn sie selbst oder mindestens ein Elternteil nicht mit deutscher Staatsangehörigkeit geboren wurde. Im Einzelnen umfasst diese Definition zugewanderte und nicht zugewanderte Ausländerinnen und Ausländer, zugewanderte und nicht zugewanderte Eingebürgerte, (Spät-) Aussiedlerinnen und (Spät-) Aussiedler sowie die als Deutsche geborenen Nachkommen dieser Gruppen.

Die Vertriebenen des Zweiten Weltkrieges haben (gemäß Bundesvertriebenengesetz) einen gesonderten Status; sie und ihre Nachkommen zählen daher nicht zur Bevölkerung mit Migrationshintergrund.

screenshot seite 67 des SRU Gutachtens von 2013 mit folgendem Text: Selbst wenn bei einer Stromversorgung aus 100 % dargebotsabhängigen erneuerbaren
Energieträgern zur Absicherung lang anhaltender Flauten im Winter 100 % der Leistung in
Form von Gasturbinen bereitgehalten werden müsste, würde sich der Strompreis für diese
Absicherung nur um etwa 0,5 ct/kWh erhöhen. Dieser Berechnung liegen Kosten der
Gasturbinen von 400 Euro/kW, eine 25-jährige Nutzungsdauer, ein Zinssatz von 5 %/a sowie
eine Bruttostromerzeugung von 509 TWh/a und eine Jahreshöchstlast von 85 GW zugrunde.
Sollte diese Reserveleistung 500 Volllaststunden pro Jahr genutzt werden bei
Brennstoffkosten in Höhe von 0,035 Euro/kWh und bei einem Wirkungsgrad von 40 %,
würde der damit erzeugte Strom rund 9 ct/kWh kosten; umgelegt auf die mit dem
Gesamtsystem produzierte jährliche Strommenge wären dies jedoch einschließlich der
Kapitalkosten nur etwa 1 ct/kWh.

Tabelle die die vorgeschlagenen Grenzwerte für verschiedene Luftschadstoffe anzeigt, 800ppm für CO2, bzw 350 über dem Außenluftwert. Daraus wird auch eine Belüftung des Raumen von mindestens 14 liter pro Sekunde pro Person abgeleitet

Buchseiten 77 und 78 von Max von Pettenkofers "Über den Luftwechsel in Wohngebäuden" https://www.digitale-sammlungen.de/de/view/bsb10767804?page=87 . In denen er beschreibt dass er in einem Klassenzimmer, einem Vorlesungsaal und einem Kneipzimmer CO2-Werte gemessen hat und mit nicht näher erklärter Methodik untersucht hat ob die Menschen über die Lufqualität klagten

Diagramm dass die Messergebnisse der Einträge auf indoorco2map.com nach Kategorie anzeigt. Arztpraxen sind die 2. schlechteste Kategorie - nur Pubs haben im Median höhere Werte.

Diagramm aus dem Anhang des in Science veröffentlichtem Artikel "Mandating indoor air quality for public buildings" . ( https://pure.tue.nl/ws/portalfiles/portal/323915223/science.adl0677_sm.pdf ) , das empfohlene Grenzwerte für CO2 in Innenräumen anzeigt von verschiedenen Ländern und Organisationen (gesamt 17 Empfehlungen. Der Niedrigste Wert von 600ppm ist in Australien "best Practice". 5 Weitere sind zwischen 650 und ~800 ppm. Eine Wert bei 900ppm. Der deutsche Wert liegt mit 1000ppm im Mittelfeld.

Screenshot des nachfolgend Verlinkten PDF (Seite 8): https://www.deutsche-lebensmittelbuch-kommission.de/fileadmin/Dokumente/LS/leitsaetze_vegan-vegetarische_lebensmittel-barrierefrei.pdf In dem -Schnitzel und und Wurst als übliche Anlehnungen für vegane und vegetarische Produkte aber Filet und Steak als unübliche beschrieben werden