Access airnow.gov. AirNow.gov

Report Summary

About Website

Visit airnow.gov now to see the best up-to-date Air Now content for United States and also check out these interesting facts you probably never knew about airnow.gov

AirNow is your one-stop source for air quality data. Our recently redesigned site highlights air quality in your local area first, while still providing air quality information at state, national, and...

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name

value

score

weighting

FCP (First Contentful Paint)

Value1.1 s

99/100

10%

LCP (Largest Contentful Paint)

Value1.1 s

100/100

25%

SI (Speed Index)

Value1.1 s

100/100

10%

TBT (Total Blocking Time)

Value0 ms

100/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value1.1 s

100/100

10%

airnow.gov

60 ms

Our browser made a total of 1 request to load all elements on the main page. We found that all of those requests were addressed to Airnow.gov and no external sources were called. The less responsive or slowest element that took the longest time to load (60 ms) belongs to the original domain Airnow.gov.

Content Size

1.1 MB

After Optimization

309.3 kB

In fact, the total size of Airnow.gov main page is 1.1 MB. This result falls within the top 5000 of lightweight and thus fast loading web pages. Only a small number of websites need less resources to load. Javascripts take 531.4 kB which makes up the majority of the site volume.

HTML Optimization

-52%

Potential reduce by 368 B

Original 706 B
After minification 609 B
After compression 338 B

HTML content can be minified and compressed by a website’s server. The most efficient way is to compress content using GZIP which reduces data amount travelling through the network between server and browser. This page needs HTML code to be minified as it can gain 97 B, which is 14% of the original size. It is highly recommended that content of this web page should be compressed using GZIP, as it can save up to 368 B or 52% of the original size.

Image Optimization

-68%

Potential reduce by 322.5 kB

Original 475.5 kB
After minification 152.9 kB

Image size optimization can help to speed up a website loading time. The chart above shows the difference between the size before and after optimization. Obviously, Air Now needs image optimization as it can save up to 322.5 kB or 68% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-73%

Potential reduce by 387.7 kB

Original 531.4 kB
After minification 505.7 kB
After compression 143.7 kB

It’s better to minify JavaScript in order to improve website performance. The diagram shows the current total size of all JavaScript files against the prospective JavaScript size after its minification and compression. It is highly recommended that all JavaScript files should be compressed and minified as it can save up to 387.7 kB or 73% of the original size.

CSS Optimization

-90%

Potential reduce by 115.2 kB

Original 127.6 kB
After minification 70.8 kB
After compression 12.4 kB

CSS files minification is very important to reduce a web page rendering time. The faster CSS files can load, the earlier a page can be rendered. Airnow.gov needs all CSS files to be minified and compressed as it can save up to 115.2 kB or 90% of the original size.

Requests Now

After Optimization

Besides the initial HTML request, no CSS, Javascripts, AJAX or image files were requested in the course of web page rendering.

Accessibility Issues

These are opportunities to improve the interpretation of your content by users in different locales.

High

<html> element does not have a [lang] attribute

These items highlight common accessibility best practices.

High

The document uses <meta http-equiv="refresh">

Search Engine Optimization Advices

To appear in search results, crawlers need access to your app.

High

Page is blocked from indexing

Language and Encoding

Language Detected

EN
Language Claimed

N/A
Encoding

N/A

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Airnow.gov can be misinterpreted by Google and other search engines. Our service has detected that English is used on the page, and neither this language nor any other was claimed in <html> or <meta> tags. Our system also found out that Airnow.gov main page’s claimed encoding is . Changing it to UTF-8 can be a good choice, as this format is commonly used for encoding all over the web and thus their visitors won’t have any troubles with symbol transcription or reading.

Social Sharing Optimization

airnow.gov

Open Graph description is not detected on the main page of Air Now. Lack of Open Graph description can be counter-productive for their social media presence, as such a description allows converting a website homepage (or other pages) into good-looking, rich and well-structured posts, when it is being shared on Facebook and other social media. For example, adding the following code snippet into HTML <head> tag will help to represent this web page correctly in social networks: