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Top Technologies

Nginx

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PHP

Programming Languages

Google Tag Manager

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Web Frameworks

19 aqicn.org Last Updated: 10 months

Success 70% of passed verification steps

Warning 7% of total warning

Errors 23% of total errors, require fast action

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

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

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

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

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

Avoid an excessive DOM size 3,420 elements

Speed And Optimization Tips

Only Registered Users

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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

Your Website Score is

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19 aqicn.org Last Updated: 10 months

Desktop

Mobile

Estimation Traffic and Earnings

Sign up for see all features and reviews about this site

Desktop

Mobile

Speed And Optimization Tips

Sign up for see all features and reviews about this site

Alexa Rank

0

Information Server

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