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19 aqicn.org Last Updated: 1 year

Success 70% of passed verification steps
Warning 7% of total warning
Errors 23% of total errors, require fast action
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Desktop

Mobile

Performance Desktop Score 65%
Best Practices Desktop Score 54%
SEO Desktop Score 80%
Progressive Web App Desktop Score 12%
Performance Mobile Score 30%
Best Practices Mobile Score 54%
SEO Mobile Score 79%
Progressive Web App Mobile Score 15%
Page Authority Authority 0%
Domain Authority Domain Authority 0%
Moz Rank 0.0/10
Bounce Rate Rate 0%
Charset Encoding
Great, language/character encoding is specified: UTF-8
Title Tag 50 Characters
BEIJING AIR POLLUTION: REAL-TIME AIR QUALITY INDEX
Meta Description 48 Characters
Real-time air pollution index for 100+ countries
Effective URL 29 Characters
http://aqicn.org/city/beijing
Excerpt Page content
Beijing Air Pollution: Real-time Air Quality Index EnglishChinese - 简体中文Japanese - 日本Spanish - españolKorean - 한국의Russian - русскийTraditional Chinese - 繁體中文French - FrancaisPolishGermanPortugueseVietnamese homeHeremapmaskfaqsearc...
Meta Keywords 17 Detected
Beijing PM2.5 Beijing AQI Beijing Air Quality Index Beijing Air Pollution Index Beijing Air Pollution Air Quality Index Air Quality Air Pollution Pollution China Air Pollution Asia Air Pollution World Air Pollution Air quality historical data Air Quality Rankings Beijing AQI Windows widget Beijing AQI android widget PM10 respirable
Keywords Cloud Density
quality63 beijing27 download13 pollution12 monday11 time11 unhealthy10 health10 data10 store10
Keyword Consistency Keyword density is one of the main terms in SEO
Keyword Freq Title Desc Domain H1 H2
quality 63
beijing 27
download 13
pollution 12
monday 11
time 11
unhealthy 10
health 10
data 10
store 10
Google Preview Your look like this in google search result
BEIJING AIR POLLUTION: REAL-TIME AIR QUALITY INDEX
http://aqicn.org/city/beijing
Real-time air pollution index for 100+ countries
Robots.txt File Detected
http://aqicn.org/robots.txt
Sitemap.xml File Detected
http://aqicn.org/sitemap.xml
Page Size Code & Text Ratio
Document Size: ~223.46 KB
Code Size: ~159.48 KB
Text Size: ~63.98 KB Ratio: 28.63%

Estimation Traffic and Earnings

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Desktop

Desktop Screenshot
Max Potential First Input Delay 150 ms
The maximum potential First Input Delay that your users could experience is the duration, in milliseconds, of the longest task
Time to Interactive 4.3 s
Time to interactive is the amount of time it takes for the page to become fully interactive
Links do not have descriptive text 3 links found
Descriptive link text helps search engines understand your content
Network Round Trip Times 0 ms
Network round trip times (RTT) have a large impact on performance. If the RTT to an origin is high, it's an indication that servers closer to the user could improve performance
Page load is not fast enough on mobile networks Interactive on simulated mobile network at 19.8 s
A fast page load over a cellular network ensures a good mobile user experience
Estimated Input Latency 50 ms
Estimated Input Latency is an estimate of how long your app takes to respond to user input, in milliseconds, during the busiest 5s window of page load. If your latency is higher than 50 ms, users may perceive your app as laggy
Serve images in next-gen formats Potential savings of 194 KB
Image formats like JPEG 2000, JPEG XR, and WebP often provide better compression than PNG or JPEG, which means faster downloads and less data consumption
Does not use HTTPS 18 insecure requests found
All sites should be protected with HTTPS, even ones that don't handle sensitive data. HTTPS prevents intruders from tampering with or passively listening in on the communications between your app and your users, and is a prerequisite for HTTP/2 and many new web platform APIs
User Timing marks and measures 1 user timing
Consider instrumenting your app with the User Timing API to measure your app's real-world performance during key user experiences
Reduce server response times (TTFB) Root document took 720 ms
Time To First Byte identifies the time at which your server sends a response
Eliminate render-blocking resources Potential savings of 290 ms
Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles
Efficiently encode images Potential savings of 16 KB
Optimized images load faster and consume less cellular data
Minimize third-party usage Third-party code blocked the main thread for 180 ms
Third-party code can significantly impact load performance. Limit the number of redundant third-party providers and try to load third-party code after your page has primarily finished loading
Total Blocking Time 420 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds.
Reduce JavaScript execution time 2.1 s
Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this
Defer offscreen images Potential savings of 66 KB
Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive
Server Backend Latencies 0 ms
Server latencies can impact web performance. If the server latency of an origin is high, it's an indication the server is overloaded or has poor backend performance
Speed Index 2.4 s
Speed Index shows how quickly the contents of a page are visibly populated
First CPU Idle 3.8 s
First CPU Idle marks the first time at which the page's main thread is quiet enough to handle input. [Learn more](https://web.dev/first-cpu-idle).
Avoids enormous network payloads Total size was 2,277 KB
Large network payloads cost users real money and are highly correlated with long load times
Minimize main-thread work 4.9 s
Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this
First Contentful Paint 0.6 s
First Contentful Paint marks the time at which the first text or image is painted
Avoid chaining critical requests 11 chains found
The Critical Request Chains below show you what resources are loaded with a high priority. Consider reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load
Avoid an excessive DOM size 3,443 elements
A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow)
First Meaningful Paint 0.7 s
First Meaningful Paint measures when the primary content of a page is visible
Keep request counts low and transfer sizes small 189 requests • 2,277 KB
To set budgets for the quantity and size of page resources, add a budget.json file
Serve static assets with an efficient cache policy 54 resources found
A long cache lifetime can speed up repeat visits to your page

Mobile

Mobile Screenshot
First Meaningful Paint 3.1 s
First Meaningful Paint measures when the primary content of a page is visible
Keep request counts low and transfer sizes small 239 requests • 3,397 KB
To set budgets for the quantity and size of page resources, add a budget.json file
Serve static assets with an efficient cache policy 62 resources found
A long cache lifetime can speed up repeat visits to your page
Max Potential First Input Delay 560 ms
The maximum potential First Input Delay that your users could experience is the duration, in milliseconds, of the longest task
Time to Interactive 22.3 s
Time to interactive is the amount of time it takes for the page to become fully interactive
Links do not have descriptive text 1 link found
Descriptive link text helps search engines understand your content
Network Round Trip Times 0 ms
Network round trip times (RTT) have a large impact on performance. If the RTT to an origin is high, it's an indication that servers closer to the user could improve performance
Page load is not fast enough on mobile networks Interactive at 22.3 s
A fast page load over a cellular network ensures a good mobile user experience
Estimated Input Latency 210 ms
Estimated Input Latency is an estimate of how long your app takes to respond to user input, in milliseconds, during the busiest 5s window of page load. If your latency is higher than 50 ms, users may perceive your app as laggy
First Contentful Paint (3G) 4652 ms
First Contentful Paint 3G marks the time at which the first text or image is painted while on a 3G network
Tap targets are not sized appropriately 50% appropriately sized tap targets
Interactive elements like buttons and links should be large enough (48x48px), and have enough space around them, to be easy enough to tap without overlapping onto other elements
Document uses legible font sizes 90.75% legible text
Font sizes less than 12px are too small to be legible and require mobile visitors to “pinch to zoom” in order to read. Strive to have >60% of page text ≥12px
Serve images in next-gen formats Potential savings of 1,161 KB
Image formats like JPEG 2000, JPEG XR, and WebP often provide better compression than PNG or JPEG, which means faster downloads and less data consumption
Does not use HTTPS 17 insecure requests found
All sites should be protected with HTTPS, even ones that don't handle sensitive data. HTTPS prevents intruders from tampering with or passively listening in on the communications between your app and your users, and is a prerequisite for HTTP/2 and many new web platform APIs
User Timing marks and measures 1 user timing
Consider instrumenting your app with the User Timing API to measure your app's real-world performance during key user experiences
Server response times are low (TTFB) Root document took 500 ms
Time To First Byte identifies the time at which your server sends a response
Eliminate render-blocking resources Potential savings of 1,000 ms
Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles
Efficiently encode images Potential savings of 16 KB
Optimized images load faster and consume less cellular data
Reduce the impact of third-party code Third-party code blocked the main thread for 2,560 ms
Third-party code can significantly impact load performance. Limit the number of redundant third-party providers and try to load third-party code after your page has primarily finished loading
Total Blocking Time 4,230 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds.
Reduce JavaScript execution time 9.7 s
Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this
Defer offscreen images Potential savings of 162 KB
Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive
Server Backend Latencies 0 ms
Server latencies can impact web performance. If the server latency of an origin is high, it's an indication the server is overloaded or has poor backend performance
Speed Index 7.9 s
Speed Index shows how quickly the contents of a page are visibly populated
First CPU Idle 18.4 s
First CPU Idle marks the first time at which the page's main thread is quiet enough to handle input. [Learn more](https://web.dev/first-cpu-idle).
Avoid enormous network payloads Total size was 3,397 KB
Large network payloads cost users real money and are highly correlated with long load times
Minimize main-thread work 18.2 s
Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this
First Contentful Paint 2.1 s
First Contentful Paint marks the time at which the first text or image is painted
Avoid chaining critical requests 11 chains found
The Critical Request Chains below show you what resources are loaded with a high priority. Consider reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load
Avoid an excessive DOM size 3,420 elements
A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow)

Speed And Optimization Tips

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Alexa Rank

0

Local Rank: / Users: / PageViews:

Global Rank

Information Server

Response Header HTTP headers carry information about the client browser, the requested page and the server 
HTTP/1.1 200 OK
Server: nginx
Date: Mon, 23 Dec 2019 02:47:38 GMT
Content-Type: text/html; charset=utf-8
Connection: keep-alive
X-Powered-By: PHP/5.4.16
X-Generated: IN
X-Server: jp2n
Content-Encoding: gzip
DNS Records DNS Resource Records associated with a hostname
View DNS Records
Type Name Value Class TTL
A aqicn.org 172.105.192.79 IN 3592
NS aqicn.org ns1.linode.com IN 86392
NS aqicn.org ns3.linode.com IN 86392
NS aqicn.org ns2.linode.com IN 86392
NS aqicn.org ns4.linode.com IN 86392
NS aqicn.org ns5.linode.com IN 86392
MX aqicn.org mail.aqicn.org IN 86400
TXT aqicn.org v=spf1 ip6:2400:8900::f03c:91ff:fe50:1725 ip4:106.185.43.97 ip6:2400:8902::f03c:91ff:fef3:6497 ip4:139.162.120.196 ~all IN 86400

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