The basic integration is simple and straight forward. You first need to add the following piece of code:

  
<script  type="text/javascript"  charset="utf-8">  
	(function  (w,  d,  t,  f)  {  
		w[f]  =  w[f]  ||  function  (c,  k,  n)  {  
			s  =  w[f],  k  =  s['k']  =  (s['k']  ||  (k  ?  ('&k='  +  k)  :  ''));  s['c']  =  
				c  =  (c  instanceof  Array)  ?  c  :  [c];  s['n']  =  n  =  n  ||  0;  L  =  d.createElement(t),  e  =  d.getElementsByTagName(t)[0];  
			L.async  =  1;  L.src  =  '//feed.aqicn.org/feed/'  +  (c[n].city)  +  '/'  +  (c[n].lang  ||  '')  +  '/feed.v1.js?n='  +  n  +  k;  
			e.parentNode.insertBefore(L,  e);  
		};  
	})(window,  document,  'script',  '_aqiFeed');    
</script>

Then, just add this other code to include the widget:

  
<span  id="city-aqi-container"></span>  
  
<script  type="text/javascript"  charset="utf-8">  
	_aqiFeed({  container:  "city-aqi-container",  city:  "beijing"  });  
</script>

The function `_aqiFeed` takes as argument the configuration block for the widget. The parameter `container: "city-aqi-container"` refers to the id of the tag in which you want to insert the widget (eg `<span id='city-aqi-container'></span>`), and the parameter city the name of the city for which you want to show the current Air Quality reading (eg `city: "london"`).

You can also specify the language to be used by setting the lang option. For instance, to include the widget in Chinese (as shown on the right), use the following code:

  
_aqiFeed({  
	container:"city-aqi-container",  
	city:"beijing",  
	lang:"cn"  
});  

The currently supported languages are:

It is possible to customize the text to be displayed within the widget by specifying the display option. For instance, to display with both the textual "AQI" name as well as the update time (as shown on the widget on the left), you can use the following code:

  
_aqiFeed({    
	display:"%cityname  AQI  is  %aqi<br><small>on  %date</small>",  
	container:"city-aqi-container-display",    
	city:"beijing"  
});  

The parameter display is an HTML-based string, and can contain any of the following keywords:

• `%cityname` for the name of the city (eg Beijing),
• `%aqi` for the decorated AQI value (eg 58),
• `%aqiv` for the undecorated (raw text) AQI value (eg 58),
• `%style` for the css declaration of the decorated AQI details (eg background-color: #ffde33;color:#000000;),
• `%date` for the time at which the AQI was updated (eg Wed 20:00),
• `%impact` for the associated health impact (eg Good, Moderate...)
• `%attribution` for the AQI data attribution ( eg Beijing Environmental Protection Monitoring Center)
• `%details` for the full AQI details (the content of the popup displayed when moving the mouse over the AQI value).

Here are a few examples:

If you prefer DIY integration, you can also specify a javascript function callback to be when the data is loaded. You just need to add the option callback in the parameter block, such as for instance:

  
_aqiFeed({  city:"beijing",  callback:function(aqi){  
	/*  Do  whatever  you  want  with  the  AQI  object  */  
	console.log(aqi);    
}  });

For instance, assuming that you are also using jquery, the following code:

  
<div  id='my-container'></div>  
<script  type="text/javascript"  charset="utf-8">  
	_aqiFeed({  
		city:  "beijing",  lang:  "pl",  callback:  function  (aqi)  {  
			$("#my-container").html(aqi.details);  
		}  
	});  
</script>

will produce the following content:

The aqi objects contains all the keywords mentioned in the section C (display format).

Including multiple widgets in a single page is possible. All you need is to pass to the `_aqiFeed` function an array with all the widgets you need to include. For instance, to insert London, Paris and New York, can do use this code:

  
var  cities  =  ["london",  "newyork",  "seoul",  "guangzhou",  "tokyo",  "shanghai",  "paris","hongkong"];  
  
var  aqiWidgetConfig  =  [];    
cities.forEach(function(city)  {  aqiWidgetConfig.push({city:city,  callback:  displayCity});  });  
_aqiFeed(aqiWidgetConfig);  
  
function  displayCity(aqi)  {  
	$("#mutiple-city-aqi").append(aqi.text("<center>%cityname<br>%aqi<br><small>%date</small></center>"));  
}  

This widget feed is provided for free, and for the sole purpose of integrating the feed into other websites (i.e. apps are excluded), and under the condition of reasonable and acceptable use. We reserve the right to change the feed structure (data format) at any time and without prior notice, so better to contact us if you plan to do a custom integration.

When doing the integration, there are few deontological rules which should be applied when using the data feed:

• First, always make sure that the attribution to the originating EPA is present. All the Air Quality data you can find on the World Air Quality Index project is thanks to the hard work from all the EPA's all over the world, so please make sure to provide the attribution for their work too. If you use the programmatic API, the attribution is available from the attribution field.
• If you are from an institution and using the data, please, show respect and pay back the credits for our work. If you are trying to scrape the data feed, please, keep in mind that this project relies on sponsorship and cooperation projects, so consider supporting us rather than scrapping us, especially if you are a large scale institution or university.
• As a matter of fact, do not act like the WRI (World Resource Institute ): Scrapping the overall World Air Quality Index project data feed, and beeing so cheap that they would not even give any attribution for our work, and this despite their 80 millions annual USD fundings. Don't believe us? Check this snapshot.

This is the first version of this new widget feed API. There are quite a few improvements already in the pipeline, such as adjustable graphic width and height, selectable AQI scale, etc. If you would like to suggest any other specific improvement, feel free to send us a message.