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i18n>The Haier AirBox device. Does it provide any useful information?</div></h1></div><script type='text/javascript'> ; if (!isMobileUA) { fitLine('#h1header1',.88,{maxfs:45}); }; </script><div class='whitebody' style='font-family:"Noto Serif",Cambria,"Palatino Linotype","Book Antiqua","URW Palladio L",serif;'><div class='section-outer'><div class='section-content' ><span style='border-bottom:1px solid #888; font-size:15px;color:#888;'>Experiment published on Friday, July 25th, 2014</span><br><span style='font-size:13px;color:#888;'>[updated on Monday, August 18th, 2014]</span><br><script src='/jscripts/moment/bundle.min.js?_=20200103.150752&type=script'></script><script src='/jscripts/d3/d3.min.js?_=20190418.093123&type=script'></script><script src='/air/view/sensor/js/sensolib.js?_=20200517.131233&type=script'></script><script src='/air/view/sensor/js/sensor-bundle.min.js?_=20220515.202405&type=script'></script><link href='/air/view/sensor/js/sensor-bundle.min.css?_=20190418.093129&type=css' rel='stylesheet'/><style >.entry-content {line-height: 1.5;}div.entry-content p:first-child:first-letter {float:left;font-size:3em;margin-right:.06em;line-height:90%;}blockquote {background: url(https://aqicn.org/images/blockquote.png) no-repeat; color: #a5a4a4;font-style: italic; margin: 30px;padding: 3px 100px 3px 80px; } </style><div style='float:right;padding-left:10px;text-align:center;max-width:50%'> <img src='/air/experiments/images/haier-airbox/haier-airbox.jpg' width=300 style='max-width:100%'> </div> <div class='entry-content' id='viewwidth' style=''><p> Haier's new <a href='http://www.ehaier.com/product/6993.html' target=_>AirBox</a> (photo on the right) is very <a href='http://www.red-dot-21.com/products/haier-air-box-air-purifier-22140' target=_>beautifully designed</a> Air Quality sensor, aimed, as part of their <a href='http://technode.com/2014/03/19/chinese-home-appliance-makers-internet-companies-rush-to-smart-home-market/' target=_>smart living</a> concept, at beeing used in conjonction with smart air conditionner. It claims to be able to sense not only Temperature, Humidity and VOC (<a href='http://en.wikipedia.org/wiki/Volatile_organic_compound'>Volatile Organic Compound</a>), but also the famous small PM2.5 particulate matter. <br> <br> From a marketign point of view, that's a beautiful storry. But, technically, that's something very different.... First, their smartphone application does not provide the real-time data graphics - but only the daily summary and a instant number which is hard to relate to anthing, as you can see from the screen shots below (<i>taken from <a href='http://www.leiphone.com/d-haier-air-box.html'>leiphone.com/d-haier-air-box.html</a></small></i>). There is a simple reason for which they do not provide the real-time graphics, updated very minutes or so: it is because their sensor is so poor that it can't detect any variation in Air Quality! You can check it by yourself from the graphs are the bottom of this article (the voc and pm2.5 readings seems to be stuck to a value of 20, regarless of the actual air quality) <center> <div > <img src='/air/experiments/images/haier-airbox/smartapp.jpg' width=397 style='max-width:90%;'> <br> </div> </center> <br> Second, the hardware sensor they use to detect the PM2.5 particulate matter is no more than the low-cost <a href='http://www.sharpsme.com/optoelectronics/sensors/air-sensors/GP2Y1010AU0F'>Sharp gp2y1010au0f</a> module. This sharp sensor is pretty much useless if you want want to get any accurate data, at least when used without any kind of data and signal processing (see <a href='http://aqicn.org/sensor/shinyei/'>our low-cost sensor experiment page</a>). So, considering that it only uses a simple 8 bits AVR (the <a href='https://www.spansion.com/products/microcontrollers/8-bit-proprietary-core/8fx/pages/mb95f698kpmc.aspx'>Spansion MB95F698K, F2MC-8FX CPU core</a>) with only has 2KB of RAM, there's just no hope for having any kind of relevant data processing algorithm which could give relevant readings. <br> <br> <center> <div > <img src='/air/experiments/images/haier-airbox/airbox-sensor.jpg' style='max-width:80%;'> <br> </div> </center> <br> <br> As a first conclusion, there is no doubt that the inherent hardware design has significant limitations on the quality of the air sensing readings. But to double confirm the conclusion with some more empericaly data, the last 30 days real-time readings from the Air Box are provided below: <br> <br> <div id='consolelog'></div> <br> <center style='border:1px solid #ccc;padding:10px;margin:10px;background-color:#eee;'> <div id='datainfo'> <center style='background:#ccc;margin:20px;'> <br> Please wait while loading data... <br> <img src='https://aqicn.org/images/285.gif'> <br> <br> </center> </div> <div id='timegraph' ></div> </center> For reference, the PM2.5 data measurements from the nearest BAM and Dylos sensor are provided (Check <a href='http://aqicn.org/sensor/beijing/sanlitun/'> this link</a> for more informations). <center style='border:1px solid #ccc;padding:10px;margin:10px;background-color:#eee;'> <div id='timegraphdylos' ></div> </center> Few comments about the graph above: <ul> <li>From time to time, data is missing. The reason is that the WIFI router on which the Haier air box is connected will automatically switch off from time to time (especially during the night). During this period, data can not be uploaded from the airbox to the Haier server. But, even worse, considering that there is not enough memory storage on the airbox AVC, there is just no way to buffer the accumlated data and send it in bulk mode when the WIFI is available again. That's really a bad design, and that's at least something that is handled in our dylos experiment setup. <br> <br> <li>The PM2.5 and VOC is desperetly stuck to discreet values such as 20 or 80. That's annoying considering that the airbox is located outside, and the measurement should reflect the actual air pollution, which you can see on the "BAM and Dylos" graph. One should expect the PM2.5 and VOC graphs to vary much more from hour to hour, and out of 1 month of collected data, there is no doubt that the readings provided by the Hair Air Box are highly not reialable. </ul> <br><br> Based on the above analysis, the Haier Air Box is disappointing. For sure, it can <b>not</b> be used for getting any accurate Air Quality information. Eventually, the temperature sensor is working fine, so it will be an ok solution for turning the Air Conditionner on and off based on the living temperature. But, this is a bit of an expensive IOT equipment, and one would expect much more from Haier. So, let's wait and see, hopefully they are already working on the next generation of this IOT Smart Living equipement. <br><br> <center><br>-<svg xmlns="http://www.w3.org/2000/svg" width="28" height="28" version="1" viewBox="0 0 26 26" enable-background="new 0 0 26 26"><path d="M 15.65625 -0.03125 C 14.280846 -0.03760636 12.828752 0.09254274 11.3125 0.40625 C 8.28651 1.0323169 5.7746616 2.1709106 3.96875 3.59375 C 2.3885774 4.8387345 1.3097647 6.3321654 1.0625 7.96875 A 1.0001 1.0001 0 0 0 1 8.40625 C 1 8.4709766 0.99753847 8.5296394 1 8.59375 C 0.99939321 8.6245955 1 8.6565744 1 8.6875 C 1.0067678 8.8049913 1.0164368 8.9159604 1.03125 9.03125 C 1.0536237 9.2185949 1.1014372 9.4156735 1.15625 9.59375 C 1.4590854 10.826485 2.2046296 11.91918 3.21875 12.78125 C 4.0779092 13.511593 5.1369309 14.083861 6.3125 14.53125 A 1.0001 1.0001 0 0 0 6.53125 14.9375 C 8.1339345 16.910035 12.101162 19.118434 18.1875 18.59375 A 1.0043849 1.0043849 0 0 0 18 16.59375 C 14.906411 16.860439 12.500325 16.269357 10.78125 15.5 C 14.30154 15.772761 18.245209 15.070028 21.71875 12.96875 A 1.0021949 1.0021949 0 1 0 20.6875 11.25 C 16.887924 13.548509 12.317006 14.000584 8.78125 13.21875 C 8.6725971 13.194724 8.5753958 13.151278 8.46875 13.125 C 10.108287 13.189898 11.88322 13.060799 13.6875 12.6875 C 16.718701 12.060355 19.36029 10.886006 21.21875 9.4375 C 23.067114 7.9968631 24.272087 6.1533076 23.875 4.21875 C 23.8732 4.20861 23.8769 4.197602 23.875 4.1875 C 23.513143 2.2541955 21.685558 1.0369822 19.4375 0.4375 C 18.307598 0.13619269 17.031654 -0.02489364 15.65625 -0.03125 z M 15.65625 1.96875 C 16.883971 1.97489 18.004902 2.1263073 18.9375 2.375 C 20.802695 2.8723854 21.754612 3.7133252 21.90625 4.5625 A 1.0001 1.0001 0 0 0 21.9375 4.625 C 22.12047 5.4788616 21.54154 6.6735055 20 7.875 C 18.45846 9.0764945 16.081299 10.145895 13.3125 10.71875 C 10.546306 11.291066 7.7660826 11.269646 5.8125 10.78125 C 4.8357087 10.537052 4.0847823 10.157122 3.625 9.78125 C 3.3682882 9.5713881 3.1893221 9.3858538 3.09375 9.1875 C 3.0413411 8.9743851 3.0082478 8.7545393 3 8.53125 C 3.0633474 7.4789308 3.7648202 6.2771492 5.1875 5.15625 C 6.6815884 3.9790894 8.91349 2.9489331 11.6875 2.375 C 13.071248 2.0887073 14.428529 1.9626064 15.65625 1.96875 z M 15.96875 3.65625 C 14.93792 3.617106 13.843984 3.69192 12.71875 3.90625 A 1.0001 1.0001 0 0 0 12.6875 3.9375 C 9.8940815 4.582135 7.6159262 5.8506824 6.5625 7.5625 A 1.0001 1.0001 0 1 0 8.25 8.625 C 8.7942179 7.740646 10.701734 6.434394 13.09375 5.875 C 13.10453 5.87295 13.11421 5.87702 13.125 5.875 C 15.064267 5.5112859 17.031887 5.6468794 18.03125 6.03125 A 1.0040202 1.0040202 0 0 0 18.75 4.15625 C 17.952461 3.8495042 16.99958 3.6953943 15.96875 3.65625 z M 9.15625 17.59375 A 1.0001 1.0001 0 0 0 8.5625 19.25 C 8.5625 19.25 11.033033 22.015963 15.53125 21.90625 A 1.0004882 1.0004882 0 1 0 15.46875 19.90625 C 11.766967 19.996537 10.0625 17.9375 10.0625 17.9375 A 1.0001 1.0001 0 0 0 9.15625 17.59375 z M 8.125 20.1875 A 1.0001 1.0001 0 0 0 7.40625 21.65625 C 7.40625 21.65625 8.6869767 23.974979 11.65625 24.09375 A 1.001098 1.001098 0 0 0 11.75 22.09375 C 9.7192733 22.012521 9.1875 20.75 9.1875 20.75 A 1.0001 1.0001 0 0 0 8.21875 20.1875 A 1.0001 1.0001 0 0 0 8.125 20.1875 z M 7.59375 23.0625 A 1.0001 1.0001 0 0 0 7.4375 23.09375 A 1.0001 1.0001 0 0 0 6.9375 23.34375 C 6.9375 23.34375 6.19375 24 5.09375 24 A 1.0001 1.0001 0 1 0 5.09375 26 C 6.99375 26 8.28125 24.84375 8.28125 24.84375 A 1.0001 1.0001 0 0 0 7.59375 23.0625 z" color="#000" ></path></svg>-<br><br></center> <br><br> For those interrested in the complete reverse engineering, you can check the page: <a href='http://www.ewisetech.com/Pages/product/prod_detail.aspx?mule=1406338776140&mid=6856&bid=6253&s=1735&dt=6822'>ewisetech.com</a> or the <a href='http://www.leiphone.com/d-haier-air-box-teardown.html'>leiphone.com</a> for hardware. For the network protocol reverse engineering, check <a href='http://www.biaji.net/wp/biaji/2014/07/%e6%88%91%e4%b9%b0%e4%ba%86%e4%b8%aa%e6%b5%b7%e5%b0%94%e7%a9%ba%e6%b0%94%e7%9b%92%e5%ad%90/' target=_>biaji.net</a> . And for those interested in extracting the data from their sensors, our scripts are avialble from <a href='https://github.com/aqicn/haier-airbox' target=github>github.com</a>  <br><br> <center><br>-<svg xmlns="http://www.w3.org/2000/svg" width="28" height="28" version="1" viewBox="0 0 26 26" enable-background="new 0 0 26 26"><path d="M 15.65625 -0.03125 C 14.280846 -0.03760636 12.828752 0.09254274 11.3125 0.40625 C 8.28651 1.0323169 5.7746616 2.1709106 3.96875 3.59375 C 2.3885774 4.8387345 1.3097647 6.3321654 1.0625 7.96875 A 1.0001 1.0001 0 0 0 1 8.40625 C 1 8.4709766 0.99753847 8.5296394 1 8.59375 C 0.99939321 8.6245955 1 8.6565744 1 8.6875 C 1.0067678 8.8049913 1.0164368 8.9159604 1.03125 9.03125 C 1.0536237 9.2185949 1.1014372 9.4156735 1.15625 9.59375 C 1.4590854 10.826485 2.2046296 11.91918 3.21875 12.78125 C 4.0779092 13.511593 5.1369309 14.083861 6.3125 14.53125 A 1.0001 1.0001 0 0 0 6.53125 14.9375 C 8.1339345 16.910035 12.101162 19.118434 18.1875 18.59375 A 1.0043849 1.0043849 0 0 0 18 16.59375 C 14.906411 16.860439 12.500325 16.269357 10.78125 15.5 C 14.30154 15.772761 18.245209 15.070028 21.71875 12.96875 A 1.0021949 1.0021949 0 1 0 20.6875 11.25 C 16.887924 13.548509 12.317006 14.000584 8.78125 13.21875 C 8.6725971 13.194724 8.5753958 13.151278 8.46875 13.125 C 10.108287 13.189898 11.88322 13.060799 13.6875 12.6875 C 16.718701 12.060355 19.36029 10.886006 21.21875 9.4375 C 23.067114 7.9968631 24.272087 6.1533076 23.875 4.21875 C 23.8732 4.20861 23.8769 4.197602 23.875 4.1875 C 23.513143 2.2541955 21.685558 1.0369822 19.4375 0.4375 C 18.307598 0.13619269 17.031654 -0.02489364 15.65625 -0.03125 z M 15.65625 1.96875 C 16.883971 1.97489 18.004902 2.1263073 18.9375 2.375 C 20.802695 2.8723854 21.754612 3.7133252 21.90625 4.5625 A 1.0001 1.0001 0 0 0 21.9375 4.625 C 22.12047 5.4788616 21.54154 6.6735055 20 7.875 C 18.45846 9.0764945 16.081299 10.145895 13.3125 10.71875 C 10.546306 11.291066 7.7660826 11.269646 5.8125 10.78125 C 4.8357087 10.537052 4.0847823 10.157122 3.625 9.78125 C 3.3682882 9.5713881 3.1893221 9.3858538 3.09375 9.1875 C 3.0413411 8.9743851 3.0082478 8.7545393 3 8.53125 C 3.0633474 7.4789308 3.7648202 6.2771492 5.1875 5.15625 C 6.6815884 3.9790894 8.91349 2.9489331 11.6875 2.375 C 13.071248 2.0887073 14.428529 1.9626064 15.65625 1.96875 z M 15.96875 3.65625 C 14.93792 3.617106 13.843984 3.69192 12.71875 3.90625 A 1.0001 1.0001 0 0 0 12.6875 3.9375 C 9.8940815 4.582135 7.6159262 5.8506824 6.5625 7.5625 A 1.0001 1.0001 0 1 0 8.25 8.625 C 8.7942179 7.740646 10.701734 6.434394 13.09375 5.875 C 13.10453 5.87295 13.11421 5.87702 13.125 5.875 C 15.064267 5.5112859 17.031887 5.6468794 18.03125 6.03125 A 1.0040202 1.0040202 0 0 0 18.75 4.15625 C 17.952461 3.8495042 16.99958 3.6953943 15.96875 3.65625 z M 9.15625 17.59375 A 1.0001 1.0001 0 0 0 8.5625 19.25 C 8.5625 19.25 11.033033 22.015963 15.53125 21.90625 A 1.0004882 1.0004882 0 1 0 15.46875 19.90625 C 11.766967 19.996537 10.0625 17.9375 10.0625 17.9375 A 1.0001 1.0001 0 0 0 9.15625 17.59375 z M 8.125 20.1875 A 1.0001 1.0001 0 0 0 7.40625 21.65625 C 7.40625 21.65625 8.6869767 23.974979 11.65625 24.09375 A 1.001098 1.001098 0 0 0 11.75 22.09375 C 9.7192733 22.012521 9.1875 20.75 9.1875 20.75 A 1.0001 1.0001 0 0 0 8.21875 20.1875 A 1.0001 1.0001 0 0 0 8.125 20.1875 z M 7.59375 23.0625 A 1.0001 1.0001 0 0 0 7.4375 23.09375 A 1.0001 1.0001 0 0 0 6.9375 23.34375 C 6.9375 23.34375 6.19375 24 5.09375 24 A 1.0001 1.0001 0 1 0 5.09375 26 C 6.99375 26 8.28125 24.84375 8.28125 24.84375 A 1.0001 1.0001 0 0 0 7.59375 23.0625 z" color="#000" ></path></svg>-<br><br></center> <br><br> </p></div> <style > .sensorval { text-shadow: rgba(128,128,128,0.5) 1px 1px 0px; font-weight:bold; background:#f8f8f8; border: 1px solid #888; text-shadow: #fff 1px 1px 0px; border-radius:2px; -moz-border-radius:2px; -webkit-border-radius:2px; -box-shadow: 0 1px 3px rgba(0,0,0,0.2); -moz-box-shadow: 0 1px 3px rgba(0,0,0,0.2); -webkit-box-shadow: 0 1px 3px rgba(0,0,0,0.2); padding:1px; margin:5px; } </style> <script type="text/javascript"> function initExperiment() { var height = 120; var width = d3.select("#viewwidth").style("width").replace("px","")-40; var ndays = 30; var gpm25 = new DylosPlot({ elt:"#timegraphdylos", pol:"pm25", height:150, width:width, title:"Measurement from nearest BAM and Dylos sensor." }); aqisrv.sensor("dylos-pm25").timeseries().then(function (data) { gpm25.plot({ d:data.data, legend:"Dylos ≥ 0.5 µ", utime:data.utime, step:600, ndays:ndays, autoscale:true, color:"#34ACAF", strokeWidth:1.5, circle:0}); }); aqisrv.sensor("bam-pm25").timeseries().then(function (data) { data.range={min:0}; gpm25.plot({ d:data.data, legend:"BAM PM2.5", utime:data.utime, step:-3600, ndays:ndays, autoscale:true, color:"red", strokeWidth:1.5, circle:0}); }); aqisrv.sensor("haier-outdoor").timeseries().then(function (cvsdata) { try { cvsdata = cvsdata.replace(/;/g,"\n"); data = d3.csv.parse(cvsdata); var sources = ["pm25","voc","humidity","temperature","mark","rank"]; var values = []; sources.forEach( function (src) { var l = []; data.forEach(function(v){ if (v[src]!="" && !isNaN(v[src])) { if (!(src=="rank" && v[src]=="0")){ l.push({t:v.date*1000,v:+v[src]}); } else { l.push({t:v.date*1000,v:null}); } } }); values[src]=l; }); var maxt = data[data.length-1].date*1000; var mint = data[0].date*1000; var count = 0, flip=0; var graph = null; sources.forEach( function (src) { if (count==0||count==2||count==4||count==5) { graph = new DylosPlot({elt:"#timegraph",height:height,width:width, maxt:maxt, mint:mint,xticks:5, title:"Reading for: "}); flip = 0; } graph.plot( { d:values[src], legend:src, ndays:ndays, autoscale:true, encoding:"cvs", average: 3, color:(!flip)?"#34ACAF":"#FF4F4B", xcircle:1, strokeWidth:1.5, holedt:4 }); count++; flip = 1 - flip; }); var utime = moment(maxt).format("MMMM Do h:mm:ss a"); var info = "Last updated on <b>"+utime+"</b>"; sources.forEach( function (src) { info += ", "+src+": <span class='sensorval'>"+data[data.length-1][src]+"</span>"; }); $("#datainfo").html(info+"<br><br>"); } catch (e) { $("#consolelog").html("Sorry, something wrong happened..... "+e); } }); } </script> <script src="https://aqicn.org/air/experiments/scripts/scatterplot.js" type="text/javascript" charset="utf-8"></script></div></div></div><a name="infoaqi"></a><div class='h1section h1section-divider'><div class='h1section-rainbow'><div></div><div></div><div></div><div></div><div></div></div><h1><div id='h1header2' style='padding:2px;font-family:"Noto Serif",Cambria,"Palatino Linotype","Book Antiqua","URW Palladio L",serif;;' i18n>About the Air Quality and Pollution Measurement:</div></h1></div><script type='text/javascript'> ; if (!isMobileUA) { fitLine('#h1header2',.88,{maxfs:45}); }; </script><div class='whitebody' style='font-family:"Noto Serif",Cambria,"Palatino Linotype","Book Antiqua","URW Palladio L",serif;'><div class='section-outer'><div class='section-content' ><center>About the Air Quality Levels<br><br><style type="text/css">#legend-full table.infoaqitable {line-height: 1.5;background-color: white;max-width: 1000px;width: 95%;margin: 0px;border: 1px solid black;cursor: pointer;}#legend-full table.infoaqitable td {padding: 5px;font-size: 15px;text-shadow: none;}#legend-full .aqiwtxt {color: #ffffff;}#legend-full .aqibtxt {color: #000000;}@media only screen and (max-width: 800px) {#legend-full table.infoaqitable {width: 98%;}}@media only screen and (max-width: 800px) {#legend-full table.infoaqitable td {display: block;}#legend-full table.infoaqitable td:nth-child(1) {display: inline-block;font-size: 1.2em;}#legend-full table.infoaqitable td:nth-child(2) {display: inline-block;font-weight: 800;font-size: 1.2em;}}</style><div id='legend-full' onclick='window.location="/scale/"'><table class="infoaqitable cautionary"><thead><tr><td>AQI</td><td i18n='generic'>Air Pollution Level</td><td i18n='generic'>Health Implications</td><td i18n='generic'>Cautionary Statement (for PM2.5)</td></tr></thead><tr style="background-color:#009966;"><td class='aqiwtxt' nowrap="true">0 - 50</td><td class='aqiwtxt' i18n='generic'>Good</td><td class='aqiwtxt' i18n='generic'>Air quality is considered satisfactory, and air pollution poses little or no risk</td><td class='aqiwtxt' i18n='generic'>None</td></tr><tr style="background-color:#ffde33" class='aqibtxt'><td class='aqibtxt' nowrap="true">51 -100</td><td class='aqibtxt' i18n='generic'>Moderate</td><td class='aqibtxt' i18n='generic'>Air quality is acceptable; however, for some pollutants there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.</td><td class='aqibtxt' i18n='generic'>Active children and adults, and people with respiratory disease, such as asthma, should limit prolonged outdoor exertion.</td></tr><tr style="background-color:#ff9933;"><td class='aqibtxt' nowrap="true">101-150</td><td class='aqibtxt' i18n='generic'>Unhealthy for Sensitive Groups</td><td class='aqibtxt' i18n='generic'>Members of sensitive groups may experience health effects. The general public is not likely to be affected.</td><td class='aqibtxt' i18n='generic'>Active children and adults, and people with respiratory disease, such as asthma, should limit prolonged outdoor exertion.</td></tr><tr style="background-color:#cc0033;"><td class='aqiwtxt' nowrap="true">151-200</td><td class='aqiwtxt' i18n='generic'>Unhealthy</td><td class='aqiwtxt' i18n='generic'>Everyone may begin to experience health effects; members of sensitive groups may experience more serious health effects</td><td class='aqiwtxt' i18n='generic'>Active children and adults, and people with respiratory disease, such as asthma, should avoid prolonged outdoor exertion; everyone else, especially children, should limit prolonged outdoor exertion</td></tr><tr style="background-color:#660099;"><td class='aqiwtxt' nowrap="true">201-300</td><td class='aqiwtxt' i18n='generic'>Very Unhealthy</td><td class='aqiwtxt' i18n='generic'>Health warnings of emergency conditions. The entire population is more likely to be affected.</td><td class='aqiwtxt' i18n='generic'>Active children and adults, and people with respiratory disease, such as asthma, should avoid all outdoor exertion; everyone else, especially children, should limit outdoor exertion.</td></tr><tr style="background-color:#7e0023;"><td class='aqiwtxt' nowrap="true">300+</td><td class='aqiwtxt' i18n='generic'>Hazardous</td><td class='aqiwtxt' i18n='generic'>Health alert: everyone may experience more serious health effects</td><td class='aqiwtxt' i18n='generic'>Everyone should avoid all outdoor exertion</td></tr></table></div><br>To know more about Air Quality and Pollution, check the <a href='http://en.wikipedia.org/wiki/Air_quality'>wikipedia Air Quality topic</a> or the <a href='http://www.airnow.gov/index.cfm?action=aqibasics.aqi'>airnow guide to Air Quality and Your Health</a>.<br><br>For very useful health advices of Beijing Doctor Richard Saint Cyr MD, check <a href='http://www.myhealthbeijing.com/'>www.myhealthbeijing.com</a> blog.<br><br></center></div></div></div><center><br><ins class="adsbygoogle" style="display:block"data-ad-client="ca-pub-0281575029452656"data-ad-slot="2455076269"data-ad-format="auto"></ins><script>(adsbygoogle = window.adsbygoogle || []).push({});</script><style type='text/css'>.usage-notice {line-height:1.5;max-width:95%;width:1000px;margin-top:10px;padding:5px;font-size: 15px;background-color:#ffffff;text-shadow: 1px 1px 1px white;-webkit-box-shadow: 1px 1px 8px -3px rgba(0,0,0,0.3);}</style><div class="textshadowwhite usage-notice" style=''><b>Usage Notice</b>: All the Air Quality data are unvalidated at the time of publication, and due to quality assurance these data may be amended, without notice, at any time. 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class="onoffswitch-switch"></span></label></div></table></center><br></div><div style='display:none;height:0px;' id='settingsdiv-arrow'><div style='width: 0; height: 0; border: 7px solid transparent;top:0px;border-top: 7px solid #fff;position:relative;;margin-left:100px;'></div></div></div><script>function CSettingsMenu(){var self=this;var isInit = false;var timeout = null;var isPopup = false;this.show = function(){log("show!");if (isPopup) {this.close();return;}isPopup = true;$("#settingsdiv-arrow").hide();$("#settingsdiv").show();var pos = $("#footer-settings-img").offset();$("#settingsdiv-outer").css({left: "0px",width: "100%",bottom: "30px"});$("#settingsdiv").css({width: "100%",textAlign: "center",boxSizing: "border-box"});};this.close = function() {log("close!");$("#settingsdiv").hide();isPopup = false;};this.onmouseover = function(){if (isPopup) return;if (!footer || !footer.isFloating()) return;if (getWindowWidth()<800) return;if (!isInit) {$('#settingsdiv-outer').show().mouseleave(function(){ self.onmouseout(); }).mouseenter(function(){ self.onmouseover(); });display("temp");isInit = true;}if (timeout) clearTimeout(timeout);timeout = null;var pos = $("#footer-settings-img").offset();var px = (pos.left+6-100);$("#settingsdiv-outer").css({left: px + "px",bottom: (30) + "px"});$("#settingsdiv").show();$("#settingsdiv-arrow").delay(150).show();var tb = document.getElementById("settingsdiv").getBoundingClientRect(), w =getWindowWidth();var ml = Math.min((w-tb.right-2),0);$("#settingsdiv-outer").css({left:(px+ml)+"px"});};this.onmouseout = function(){if (isPopup) return;isShown = false;if (timeout) clearTimeout(timeout);timeout = setTimeout(function(){$("#settingsdiv").slideUp(200);$("#settingsdiv-arrow").hide();},150);};this.click = function(item){var status = store.get('aqicn-settings-'+item);store.set('aqicn-settings-'+item,status==1?2:1);display(item);if (item=="temp") convertTemperature();};this.val = function(item) {var 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