How much NO2 would you need in the air for it to be an immediate threat?
The article says that nitrogen dioxide is an "insidious deadly poison". Does "insidious" have some kind of meaning in terms of poison/environment control? Or is this merely excessive rhetoric? If rhetoric, then "insidious" should be excised. WpZurp 02:18, 16 Feb 2005 (UTC)
I remember being in a high school chemistry class in about 1997. The teacher left the room and the class clown decided to mix some reagents together in a beaker. I think there was about 30mL of concentrated nitric acid, among other things. Immediately a thick red-brown gas with a pungent ozone-like odour billowed out of the beaker. He watched it for a few seconds then washed the reagents down the sink with water. Of course we were all shouting at him not to be an idiot.
We didn't evacuate and the smell lingered for quite some time. I wonder if anyone can speculate as to how much danger we were in? -- FP <talk> <edits> 05:47, August 6, 2005 (UTC)
Just smelling this gas at low concentrations (like after this experiment in the room) will not kill you nor induce wounds. In concentrations which make people cough, it still isn't so dangerous if you cover your mouth and nose with a piece of cloth. It is a corrosive like chlorine and ozone are. It's not specially toxic like HCN, for example. Endimion17 ( talk) 14:42, 25 August 2008 (UTC)
The data for NO2 and N2O4 are not very consistent in literature, probably because they always exist together in equilibrium. Verification of the data is recommended before use. R6144 14:45, 26 August 2005 (UTC)
Is Nitrogen Dioxide less dense than air?
The article says density is "3.4 kg/m³, gas at 294.25 K" ... doesn't make sense. Should be approx. 46/29 * 1.2 kg/m3 = 1.9 kg/m3 ... ? —Preceding unsigned comment added by 193.75.93.34 ( talk) 08:34, 2 April 2008 (UTC)
why doesnt this molecule have a picture?
SEASONAL RELATIONSHIP OF SUDDEN INFANT DEATH SYNDROME AND ENVIRONMENTAL POLLUTANTS1 TOKE HOPPENBROUWERS2, MARY CALUB, KAZUKO ARAKAWA and JOAN E. HODGMAN American Journal of Epidemiology 1981 Vol. 113, No. 6: 623-635 [1]
Outdoor carbon monoxide, nitrogen dioxide, and sudden infant death syndrome H Klonoff-Cohen1, P K Lam1 and A Lewis Archives of Disease in Childhood 2005;90:750-753 [2]
The San Diego guys where not the first and the link is brooken anyway. Pollution can cause it would be a better clue than NO2 alone.-- Stone 06:43, 2 August 2006 (UTC)
Does anyone know if NO2 is created when a lit match under a globe is microwaved? This is the subject of an interesting MySpace clip ( http://www.youtube.com/watch?v=zM6NLKY2SHk) and I just wondered if the gentleman performing the experiment knew what he was talking about (when he claimed that the process created NO2 ... "So don't breath it!" he said). JimScott 16:31, 8 June 2007 (UTC)
-- Jonnerrs 20:24, 30 August 2007 (UTC)In formulating metallic silver(Al)/Gold (Cu/Zn) inks and paints based on cellulose nitrate (NC - Gun Cotton)(disolved in esters), if there is a degree of water present, the cellulose nitrate will be partially reduced to cellulose and NO2=N204. Which becomes apparent as a reddish brown gas, with an astringent smell. I can only cite personal experience here.-- Jonnerrs 20:24, 30 August 2007 (UTC)
It is grouped as a 'bleach' in the bottom. But nothing is mentioned in the article? —Preceding unsigned comment added by 219.78.11.87 ( talk) 09:53, 17 December 2007 (UTC)
Are these Lewis structures correct? It doesn't seem possible for NO2 to have 2 double bonds.
Kundai andrew ( talk) 08:39, 3 October 2008 (UTC)
The Image isn't showing two double bonds, it's showing a 1.5 bond. Dotted lines mean a "half bond" or a third of a bond, it happens when there are resonance structures. Havabighed ( talk) 06:07, 4 July 2012 (UTC)
I think it's worth revisiting this issue again. I've made File:NO2-Lewis-resonance.png, but there's also a pair of structures with the unpaired electron on oxygen and no charges. See http://www.madsci.org/posts/archives/2000-02/951452623.Ch.r.html for details. This would be a useful addition to the article if we can explain it well in the text.
-- Ben ( talk) 18:48, 3 June 2016 (UTC)
NO2 is formed from vehicle, power plant and other industrial emissions, and contributes to the formation of fine particle pollution and smog.
Short-term exposures to NO2 have been linked to impaired lung function and increased respiratory infections, especially in people with asthma.
The EPA one-hour standard for NO2 is a level of 100 parts per billion (ppb). The annual average standard is 53 ppb. [1]
OpenDocument —Preceding unsigned comment added by Ocdcntx ( talk • contribs) 15:49, 26 January 2010 (UTC)
![]() | This ![]() It is of interest to the following WikiProjects: | |||||||||||||
|
Is this a compound created by combustion of nitromethane with air (i.e. top fuel drag racing fuel)? I was at a drag race the other day and experienced the exhaust fumes (it's something the fans love to do, apparently). Eyes water, nose stings, throat stings, almost choking, etc.. My educated guess told me it's probably a nitrogen oxide reacting with water in eyes/mucous membranes.. Is NO2 the culprit? -- 24.21.133.196 ( talk) 00:29, 15 July 2010 (UTC)
"The paramagnetic monomer is favored."
Is this some sort of joke? Even after reading the introductions to paramagnetism and monomers, I have no idea which of the two molecules is being talked about. This is supposed to be an encyclopedia, not a chemistry puzzle site. Can somebody please edit it so it's actually helpful to somebody without a PhD in chemistry? — Preceding unsigned comment added by 86.147.85.84 ( talk) 19:21, 3 October 2011 (UTC)
monomer = NO2, dimer = N2O4 (two molecules of NO2 bonded together). I agree the wording is probably unnecessary. Why not "NO2 is favored at higher temperatures, while at lower temperatures, dinitrogen tetroxide (N2O4) predominates. Colourless dinitrogen tetroxide (N2O4) can be obtained as a solid (melting point −11.2 °C). NO2 is paramagnetic, while N2O4 is diamagnetic." — Preceding unsigned comment added by 98.194.35.233 ( talk) 23:48, 13 August 2012 (UTC) Oops, this was me, forgot to log in Vultur ( talk) 00:56, 14 August 2012 (UTC)
Between 2005 and 2011, the concentration of NO<sub>2</sub> across the United States greatly diminished. "The shift is the result of regulations, technology improvements and economic changes, scientists say."<ref>{{cite web|url=http://www.nasa.gov/content/goddard/new-nasa-images-highlight-us-air-quality-improvement/|title=New NASA Images Highlight U.S. Air Quality Improvement|date=26 June 2014|accessdate=15 July 2014|publisher=NASA}}</ref>
Although someone ought to reword the second sentence so as not to plagiarize and expand on some of the technical aspects. - Sweet Nightmares 01:59, 16 July 2014 (UTC)
The comment(s) below were originally left at Talk:Nitrogen dioxide/Comments, and are posted here for posterity. Following several discussions in past years, these subpages are now deprecated. The comments may be irrelevant or outdated; if so, please feel free to remove this section.
The article mentioned that Nitrogen and oxygen react at "elevated temperatures" - how high temperatures, precisely? |
Last edited at 23:31, 18 June 2008 (UTC). Substituted at 01:19, 30 April 2016 (UTC)
Above 1600 °C (2900 °F), see /info/en/?search=NOx#Thermal Simon de Danser ( talk) 16:47, 21 November 2020 (UTC)
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Is Nitrogen Dioxide a Greenhouse Gas? I can't find the answer to this any where on the internet!! - Guest30 — Preceding unsigned comment added by 203.221.110.175 ( talk) 06:50, 24 April 2020 (UTC)
Here you go: "Neither nitric oxide nor nitrogen dioxide are greenhouse gases" see http://www.soest.hawaii.edu/mguidry/Unnamed_Site_2/Chapter%202/Chapter2C3.html Wait.... There is more.... "There are also several gases that, although they do not have a commonly agreed upon direct radiative forcing effect, do influence the global radiation budget. These tropospheric gases include carbon monoxide (CO), nitrogen dioxide (NO2), sulfur dioxide (SO2), and tropospheric (ground level) ozone (O3)." See https://ghginstitute.org/2010/06/15/what-are-greenhouse-gases/ The factors that make up a Greenhouse Gas are it's concentration and it's absorption spectrum.
Simon de Danser ( talk) 16:43, 21 November 2020 (UTC)
From the article. "Another study examined the relationship between nitrogen exposure in the home and respiratory symptoms and found a statistically significant odds ratio of 2.23 (95% CI: 1.06, 4.72) among those with a medical diagnosis of asthma and gas stove exposure.[32]"
Should this be 'nitrogen dioxide exposure' rather than 'nitrogen exposure' ? I don't have a copy of the cited reference. Wsmurdoch ( talk) 01:03, 5 December 2020 (UTC)wsmurdoch
The "Human-caused sources and exposure" section of the article refers to indoor exposure from "butane and kerosene heaters and stoves," and gives its source as ref 19, a PDF. I don't see any mention in the PDF of butane or kerosene, though, or even of stoves/ranges - all I see it talking about is "unvented gas heating appliances," which to my mind would be heaters (but not stoves/ranges) using natural gas or propane/LP gas. Butane can be in LP gas, I guess, but kerosene isn't even a gas! Is "heaters" in this PDF elsewhere defined to include stoves/ranges? Why was kerosene mentioned? Am I just being obtuse? :-) Paul314159 ( talk) 17:44, 5 December 2020 (UTC)
Its stated as 1.880 g/L but if you calculate it with it weight N (14,0067) + 2 * O (15,999) = 46,0047 g/mol. Knowing 1 mol equals 22,4 liter: 46,0047/22,4 = 2,053 g/L. Whicht is right? — Preceding unsigned comment added by 145.8.179.210 ( talk) 09:41, 30 March 2022 (UTC)
The article has 40 citations. 34 are to hazards, environment, etc. 6 to technology, chemistry. One appreciates that it takes little expertise to cite hazards, environment, etc, so maybe that is the explanation for this strange emphasis on safety issues, but this ratio is out of proportion, an example of WP:UNDUE. -- Smokefoot ( talk) 15:17, 5 August 2022 (UTC)
75103 citations in SciFinder to the NO2, of which 48952 have appeared since the year 2002, of which 993 are classified as reviews.-- Smokefoot ( talk) 15:17, 5 August 2022 (UTC)
Right now, the reactivity/instability marker is listed as "2," however most sources I've found list it at "0." (See: [3] https://cameochemicals.noaa.gov/chemical/4072). I'm not sure where the rating here was obtained, as I saw no source for that (sorry if I just missed it). I'm going to go ahead and change it to match the versions I've seen elsewhere, but it may be worth someone who's more active in the chemistry areas of Wikipedia to have a look around maybe? 207.191.198.38 ( talk) 20:24, 4 March 2023 (UTC)
How much NO2 would you need in the air for it to be an immediate threat?
The article says that nitrogen dioxide is an "insidious deadly poison". Does "insidious" have some kind of meaning in terms of poison/environment control? Or is this merely excessive rhetoric? If rhetoric, then "insidious" should be excised. WpZurp 02:18, 16 Feb 2005 (UTC)
I remember being in a high school chemistry class in about 1997. The teacher left the room and the class clown decided to mix some reagents together in a beaker. I think there was about 30mL of concentrated nitric acid, among other things. Immediately a thick red-brown gas with a pungent ozone-like odour billowed out of the beaker. He watched it for a few seconds then washed the reagents down the sink with water. Of course we were all shouting at him not to be an idiot.
We didn't evacuate and the smell lingered for quite some time. I wonder if anyone can speculate as to how much danger we were in? -- FP <talk> <edits> 05:47, August 6, 2005 (UTC)
Just smelling this gas at low concentrations (like after this experiment in the room) will not kill you nor induce wounds. In concentrations which make people cough, it still isn't so dangerous if you cover your mouth and nose with a piece of cloth. It is a corrosive like chlorine and ozone are. It's not specially toxic like HCN, for example. Endimion17 ( talk) 14:42, 25 August 2008 (UTC)
The data for NO2 and N2O4 are not very consistent in literature, probably because they always exist together in equilibrium. Verification of the data is recommended before use. R6144 14:45, 26 August 2005 (UTC)
Is Nitrogen Dioxide less dense than air?
The article says density is "3.4 kg/m³, gas at 294.25 K" ... doesn't make sense. Should be approx. 46/29 * 1.2 kg/m3 = 1.9 kg/m3 ... ? —Preceding unsigned comment added by 193.75.93.34 ( talk) 08:34, 2 April 2008 (UTC)
why doesnt this molecule have a picture?
SEASONAL RELATIONSHIP OF SUDDEN INFANT DEATH SYNDROME AND ENVIRONMENTAL POLLUTANTS1 TOKE HOPPENBROUWERS2, MARY CALUB, KAZUKO ARAKAWA and JOAN E. HODGMAN American Journal of Epidemiology 1981 Vol. 113, No. 6: 623-635 [1]
Outdoor carbon monoxide, nitrogen dioxide, and sudden infant death syndrome H Klonoff-Cohen1, P K Lam1 and A Lewis Archives of Disease in Childhood 2005;90:750-753 [2]
The San Diego guys where not the first and the link is brooken anyway. Pollution can cause it would be a better clue than NO2 alone.-- Stone 06:43, 2 August 2006 (UTC)
Does anyone know if NO2 is created when a lit match under a globe is microwaved? This is the subject of an interesting MySpace clip ( http://www.youtube.com/watch?v=zM6NLKY2SHk) and I just wondered if the gentleman performing the experiment knew what he was talking about (when he claimed that the process created NO2 ... "So don't breath it!" he said). JimScott 16:31, 8 June 2007 (UTC)
-- Jonnerrs 20:24, 30 August 2007 (UTC)In formulating metallic silver(Al)/Gold (Cu/Zn) inks and paints based on cellulose nitrate (NC - Gun Cotton)(disolved in esters), if there is a degree of water present, the cellulose nitrate will be partially reduced to cellulose and NO2=N204. Which becomes apparent as a reddish brown gas, with an astringent smell. I can only cite personal experience here.-- Jonnerrs 20:24, 30 August 2007 (UTC)
It is grouped as a 'bleach' in the bottom. But nothing is mentioned in the article? —Preceding unsigned comment added by 219.78.11.87 ( talk) 09:53, 17 December 2007 (UTC)
Are these Lewis structures correct? It doesn't seem possible for NO2 to have 2 double bonds.
Kundai andrew ( talk) 08:39, 3 October 2008 (UTC)
The Image isn't showing two double bonds, it's showing a 1.5 bond. Dotted lines mean a "half bond" or a third of a bond, it happens when there are resonance structures. Havabighed ( talk) 06:07, 4 July 2012 (UTC)
I think it's worth revisiting this issue again. I've made File:NO2-Lewis-resonance.png, but there's also a pair of structures with the unpaired electron on oxygen and no charges. See http://www.madsci.org/posts/archives/2000-02/951452623.Ch.r.html for details. This would be a useful addition to the article if we can explain it well in the text.
-- Ben ( talk) 18:48, 3 June 2016 (UTC)
NO2 is formed from vehicle, power plant and other industrial emissions, and contributes to the formation of fine particle pollution and smog.
Short-term exposures to NO2 have been linked to impaired lung function and increased respiratory infections, especially in people with asthma.
The EPA one-hour standard for NO2 is a level of 100 parts per billion (ppb). The annual average standard is 53 ppb. [1]
OpenDocument —Preceding unsigned comment added by Ocdcntx ( talk • contribs) 15:49, 26 January 2010 (UTC)
![]() | This ![]() It is of interest to the following WikiProjects: | |||||||||||||
|
Is this a compound created by combustion of nitromethane with air (i.e. top fuel drag racing fuel)? I was at a drag race the other day and experienced the exhaust fumes (it's something the fans love to do, apparently). Eyes water, nose stings, throat stings, almost choking, etc.. My educated guess told me it's probably a nitrogen oxide reacting with water in eyes/mucous membranes.. Is NO2 the culprit? -- 24.21.133.196 ( talk) 00:29, 15 July 2010 (UTC)
"The paramagnetic monomer is favored."
Is this some sort of joke? Even after reading the introductions to paramagnetism and monomers, I have no idea which of the two molecules is being talked about. This is supposed to be an encyclopedia, not a chemistry puzzle site. Can somebody please edit it so it's actually helpful to somebody without a PhD in chemistry? — Preceding unsigned comment added by 86.147.85.84 ( talk) 19:21, 3 October 2011 (UTC)
monomer = NO2, dimer = N2O4 (two molecules of NO2 bonded together). I agree the wording is probably unnecessary. Why not "NO2 is favored at higher temperatures, while at lower temperatures, dinitrogen tetroxide (N2O4) predominates. Colourless dinitrogen tetroxide (N2O4) can be obtained as a solid (melting point −11.2 °C). NO2 is paramagnetic, while N2O4 is diamagnetic." — Preceding unsigned comment added by 98.194.35.233 ( talk) 23:48, 13 August 2012 (UTC) Oops, this was me, forgot to log in Vultur ( talk) 00:56, 14 August 2012 (UTC)
Between 2005 and 2011, the concentration of NO<sub>2</sub> across the United States greatly diminished. "The shift is the result of regulations, technology improvements and economic changes, scientists say."<ref>{{cite web|url=http://www.nasa.gov/content/goddard/new-nasa-images-highlight-us-air-quality-improvement/|title=New NASA Images Highlight U.S. Air Quality Improvement|date=26 June 2014|accessdate=15 July 2014|publisher=NASA}}</ref>
Although someone ought to reword the second sentence so as not to plagiarize and expand on some of the technical aspects. - Sweet Nightmares 01:59, 16 July 2014 (UTC)
The comment(s) below were originally left at Talk:Nitrogen dioxide/Comments, and are posted here for posterity. Following several discussions in past years, these subpages are now deprecated. The comments may be irrelevant or outdated; if so, please feel free to remove this section.
The article mentioned that Nitrogen and oxygen react at "elevated temperatures" - how high temperatures, precisely? |
Last edited at 23:31, 18 June 2008 (UTC). Substituted at 01:19, 30 April 2016 (UTC)
Above 1600 °C (2900 °F), see /info/en/?search=NOx#Thermal Simon de Danser ( talk) 16:47, 21 November 2020 (UTC)
Hello fellow Wikipedians,
I have just modified one external link on Nitrogen dioxide. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
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Is Nitrogen Dioxide a Greenhouse Gas? I can't find the answer to this any where on the internet!! - Guest30 — Preceding unsigned comment added by 203.221.110.175 ( talk) 06:50, 24 April 2020 (UTC)
Here you go: "Neither nitric oxide nor nitrogen dioxide are greenhouse gases" see http://www.soest.hawaii.edu/mguidry/Unnamed_Site_2/Chapter%202/Chapter2C3.html Wait.... There is more.... "There are also several gases that, although they do not have a commonly agreed upon direct radiative forcing effect, do influence the global radiation budget. These tropospheric gases include carbon monoxide (CO), nitrogen dioxide (NO2), sulfur dioxide (SO2), and tropospheric (ground level) ozone (O3)." See https://ghginstitute.org/2010/06/15/what-are-greenhouse-gases/ The factors that make up a Greenhouse Gas are it's concentration and it's absorption spectrum.
Simon de Danser ( talk) 16:43, 21 November 2020 (UTC)
From the article. "Another study examined the relationship between nitrogen exposure in the home and respiratory symptoms and found a statistically significant odds ratio of 2.23 (95% CI: 1.06, 4.72) among those with a medical diagnosis of asthma and gas stove exposure.[32]"
Should this be 'nitrogen dioxide exposure' rather than 'nitrogen exposure' ? I don't have a copy of the cited reference. Wsmurdoch ( talk) 01:03, 5 December 2020 (UTC)wsmurdoch
The "Human-caused sources and exposure" section of the article refers to indoor exposure from "butane and kerosene heaters and stoves," and gives its source as ref 19, a PDF. I don't see any mention in the PDF of butane or kerosene, though, or even of stoves/ranges - all I see it talking about is "unvented gas heating appliances," which to my mind would be heaters (but not stoves/ranges) using natural gas or propane/LP gas. Butane can be in LP gas, I guess, but kerosene isn't even a gas! Is "heaters" in this PDF elsewhere defined to include stoves/ranges? Why was kerosene mentioned? Am I just being obtuse? :-) Paul314159 ( talk) 17:44, 5 December 2020 (UTC)
Its stated as 1.880 g/L but if you calculate it with it weight N (14,0067) + 2 * O (15,999) = 46,0047 g/mol. Knowing 1 mol equals 22,4 liter: 46,0047/22,4 = 2,053 g/L. Whicht is right? — Preceding unsigned comment added by 145.8.179.210 ( talk) 09:41, 30 March 2022 (UTC)
The article has 40 citations. 34 are to hazards, environment, etc. 6 to technology, chemistry. One appreciates that it takes little expertise to cite hazards, environment, etc, so maybe that is the explanation for this strange emphasis on safety issues, but this ratio is out of proportion, an example of WP:UNDUE. -- Smokefoot ( talk) 15:17, 5 August 2022 (UTC)
75103 citations in SciFinder to the NO2, of which 48952 have appeared since the year 2002, of which 993 are classified as reviews.-- Smokefoot ( talk) 15:17, 5 August 2022 (UTC)
Right now, the reactivity/instability marker is listed as "2," however most sources I've found list it at "0." (See: [3] https://cameochemicals.noaa.gov/chemical/4072). I'm not sure where the rating here was obtained, as I saw no source for that (sorry if I just missed it). I'm going to go ahead and change it to match the versions I've seen elsewhere, but it may be worth someone who's more active in the chemistry areas of Wikipedia to have a look around maybe? 207.191.198.38 ( talk) 20:24, 4 March 2023 (UTC)