Csl.noaa.gov - SEO Checker

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Overview of the SEO Check
Meta information
79% 
Page quality
53% 
Page structure
91% 
Link structure
83% 
Server
13% 
External factors
100% 
SEO Score
Response time
1.21 s
File size
24.30 kB
Words
296
Media files
21
Number of links
86 internal / 17 external

Task list of SEO Improvements

Meta specifications

Title
(Critically important)
NOAA Chemical Sciences Laboratory
The length of the page title is perfect. (333 pixels out of 580 max pixel length)
There are no duplicate words in the title
Meta description
(Critically important)
NOAA Chemical Sciences Laboratory (CSL): Advancing scientific understanding of the chemical and physical processes that affect Earth's atmospheric composition and climate.
The meta description is too long: 1087 pixels from max. 1000 pixels. Optimize description
Crawlability
(Critically important)
There are no problems in accessing the website.
Canonical URL
(Important)
No canonical link is specified.
Language
(Somewhat important)
Language detected in text: en
Language defined in HTML: en
Server location: United States of America
The following language is defined by HTML: en
Alternate/Hreflang Links
(Somewhat important)
There are no alternate links specified on this page.
Other meta tags
(Somewhat important)
There is no rel next meta tag on this page.
There is no rel prev meta tag on this page.
Domain
(Somewhat important)
This page is hosted on a subdomain. Use a top level domain for better SEO results.
The domain does not contain non-latin characters.
Page URL
(Somewhat important)
No parameters were found in the URL.
No session ID was found in the URL.
The URL does not have too many subdirectories.
Charset encoding
(Somewhat important)
The charset encoding (UTF-8) is set correctly.
Doctype
(Nice to have)
The doctype HTML 5 is set correctly.
The doctype is placed at first in the HTML code.
Favicon
(Nice to have)
The favicon is linked correctly.

Meta tags

NameValue
viewportwidth=device-width, initial-scale=1
authorNOAA Chemical Sciences Laboratory (CSL)
keywordsnoaa, national oceanic and atmospheric administration, earth system research, esrl, chemical sciences laboratory, csl, chemical sciences, atmospheric research, atmospheric composition, climate, air quality, air chemistry, air pollution, ozone layer, stratospheric ozone, ozone depletion, ozone recovery, radiatiave balance, research groups, research programs
descriptionNOAA Chemical Sciences Laboratory (CSL): Advancing scientific understanding of the chemical and physical processes that affect Earth's atmospheric composition and climate.
DC.descriptionNOAA Chemical Sciences Laboratory (CSL): Advancing scientific understanding of the chemical and physical processes that affect Earth's atmospheric composition and climate.
DC.titleNOAA Chemical Sciences Laboratory
langen
og:descriptionNOAA CSL: Advancing scientific understanding of the chemical and physical processes that affect Earth's atmospheric composition and climate.
og:titleNOAA Chemical Sciences Laboratory
og:imagehttps://csl.noaa.gov/img/csl-og.png
X-UA-CompatibleIE=edge
charsetutf-8

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Page quality

Content
(Critically important)
No paragraphs were detected.
There are only 296 words on this page. Good pages should have about 800 words of useful content.
18.6% of the text are stop words.
Keywords used in the page title are also used in the page content. That's good!
Words from the H1 heading are used in the page content.
The page contains a listing, which indicates a good text layout.
No placeholders texts or images were found.
Frames
(Critically important)
This page does not use a frameset.
Mobile optimization
(Somewhat important)
No Apple touch icon is specified.
This page loads 4 JavaScript files. This may affect the load time negatively.
A viewport "width=device-width, initial-scale=1" is provided.
Bold and strong tags
(Somewhat important)
The usage of strong and bold tags is perfect. We recommend the use of up to 6 tags for this page.
Image SEO
(Somewhat important)
Alt text (alternative text) is correctly used on all found images.
Social Networks
(Nice to have)
This page is optimized perfectly for social networks.
Additional markup
(Nice to have)
No additional page markup was found.
HTTPS
(Somewhat important)
This website uses HTTPS to protect privacy and integrity of the exchanged data.
All included files are also transferred via HTTPS.

Media list

URLAlt attributeTitle
https://csl.noaa.gov/img/noaa.pngNOAA
https://csl.noaa.gov/img/noaa.pngNOAA
https://csl.noaa.gov/img/csl-head.pngChemical Sciences Laboratory
https://csl.noaa.gov/images/explore/erb.jpgEarth's Radiation BudgetEarth's Radiation Budget
/images/explore/airmaps.pngAIRMAPSAIRMAPS
/images/explore/sabre.pngSABRESABRE
/images/explore/ages.jpgAGES+AGES+
/news/2025/images/426_0324.jpgPublication HighlightPublication Highlight
/news/2025/images/425_0313.jpgPublication HighlightPublication Highlight
/news/2024/images/400_0320/shiptracks.pngPublication HighlightPublication Highlight
/news/images/2024agu.pngMeetingMeeting
/news/images/20241202.pngFeatureFeature
/groups/csl2/images/cover.jpgCSL2CSL2
/groups/csl6/images/cover.jpgCSL6CSL6
/groups/csl3/images/cover.jpgCSL3CSL3
/groups/csl5/images/cover.jpgCSL5CSL5
/groups/csl8/images/cover.jpgCSL8CSL8
/groups/csl9/images/cover.jpgCSL9CSL9
/groups/csl4/images/cover.jpgCSL4CSL4
/groups/csl7/images/cover.jpgCSL7CSL7
https://csl.noaa.gov/img/csl.pngNOAA CSL

Page structure

H1 heading
(Critically important)
Chemical Sciences Laboratory
The H1 heading is perfect.
Headings
(Important)
Some headings occur twice on the page.

Heading structure

Heading levelContent
H1 Chemical Sciences Laboratory
H2 Research Highlights
H2 News & Events
H2 Research Programs
H3 Advancing our understanding of atmospheric composition and climate
H4 Publication Highlight
H4 Publication Highlight Duplicate text
H4 Publication Highlight Duplicate text
H4 AGU24
H4 The New York Times
H4 Our Organization
H4 Chemical Sciences Laboratory (CSL)
H4 Connect with Us
H5 Earth's Radiation Budget
H5 AIRMAPS
H5 SABRE
H5 AGES+
H5 Aerosol Properties & Processes
H5 Atmospheric Composition & Chemical Processes
H5 Atmospheric Remote Sensing
H5 Chemical Processes & Instrument Development
H5 Chemistry & Climate Processes
H5 Clouds, Aerosol, & Climate
H5 Atmospheric Composition Modeling
H5 Tropospheric Chemistry
Some anchor texts are used more than once.
The number of internal links is ok.
None of the anchor texts is too long.
All internal links are not using dynamic parameters.
There are 17 external links on this page.

Found links on this page

LinkAttributesAnchor text
https://www.noaa.gov/External Subdomain IMG-ALT NOAA
A-TITLE NOAA
https://csl.noaa.gov/Chemical Sciences Laboratory
A-TITLE CSL
https://www.noaa.gov/External Subdomain Text duplicate IMG-ALT NOAA
A-TITLE NOAA
https://csl.noaa.gov/CSL
A-TITLE CSL
https://csl.noaa.gov/about.htmlAbout Us
https://csl.noaa.gov/mission.htmlMission & Vision
https://csl.noaa.gov/strategy/Strategy
https://csl.noaa.gov/org.htmlOrganization
https://csl.noaa.gov/origins/Origins
/partnerships/Partnerships
https://csl.noaa.gov/reviews/Science Reviews
https://csl.noaa.gov/contact.htmlContact Us
https://csl.noaa.gov/groups/csl/Office of the Director
https://csl.noaa.gov/groups/csl1/Administrative Office
https://csl.noaa.gov/groups/its/Information Technology
https://csl.noaa.gov/staff/Staff Listing
https://csl.noaa.gov/careers/Careers / Jobs
/visiting.htmlVisiting Us
https://csl.noaa.gov/research/Research
https://csl.noaa.gov/groups/Programs
/research/erb/Earth's Radiation Budget
https://csl.noaa.gov/field.htmlField Campaigns
https://csl.noaa.gov/instruments/Instrumentation
/datasets.htmlDatasets
https://csl.noaa.gov/assessments/Assessments
https://csl.noaa.gov/learn/Education & Outreach
https://csl.noaa.gov/pubs/Peer-Reviewed Publications
https://csl.noaa.gov/factsheets/Fact Sheets & Reports
/news/newsletters/Newsletters
https://csl.noaa.gov/news/News & Events
/news/postcards/Postcards from the Field
https://csl.noaa.gov/seminars/Seminar Schedule
https://csl.noaa.gov/awards/Awards & Recognition
/internal.htmlInside CSL
https://csl.noaa.gov/internal/Intranet
https://csl.noaa.gov/safety/Safety Program
https://www.google.com/External Subdomain NOAA UMS - Google Apps
https://www.boulder.doc.gov/do...External Subdomain Boulder Labs Site Status
https://csl.noaa.gov/about.htmlText duplicate About Us
https://csl.noaa.gov/research/Text duplicate Research
https://csl.noaa.gov/field.htmlText duplicate Field Campaigns
https://csl.noaa.gov/assessments/Scientific Assessments
https://csl.noaa.gov/pubs/Publications
https://csl.noaa.gov/seminars/Seminars
https://csl.noaa.gov/learn/Text duplicate Education & Outreach
/research/erb/Text duplicate IMG-ALT Earth's Radiation Budget
/research/erb/Text duplicate Earth's Radiation Budget
/projects/airmaps/IMG-ALT AIRMAPS
/projects/airmaps/Text duplicate AIRMAPS
/projects/sabre/IMG-ALT SABRE
/projects/sabre/Text duplicate SABRE
/projects/ages/IMG-ALT AGES+
/projects/ages/Text duplicate AGES+
https://csl.noaa.gov/news/Text duplicate News & Events
/news/2025/426_0324.htmlIMG-ALT Publication Highlight
/news/2025/426_0324.htmlText duplicate Publication Highlight
/news/2025/426_0324.htmlInjecting light-reflecting particles into the stratosphere could also make marine clouds brighter
/news/2025/426_0324.htmlText duplicate Injecting light-reflecting particles into the stratosphere could also make marine clouds brighter
/news/2025/425_0313.htmlText duplicate IMG-ALT Publication Highlight
/news/2025/425_0313.htmlText duplicate Publication Highlight
/news/2025/425_0313.htmlCooking emissions rival fossil fuels as an ozone pollution source
/news/2025/425_0313.htmlText duplicate Cooking emissions rival fossil fuels as an ozone pollution source
/news/2025/423_0113.htmlText duplicate IMG-ALT Publication Highlight
/news/2025/423_0113.htmlText duplicate Publication Highlight
/news/2025/423_0113.htmlScientists turn to artificial intelligence to assess the warming effect of reduced pollution
/news/2025/423_0113.htmlText duplicate Scientists turn to artificial intelligence to assess the warming effect of reduced pollution
/news/2024/419_1202.htmlIMG-ALT Meeting
/news/2024/419_1202.htmlAGU24
/news/2024/419_1202.htmlCSL at the 2024 AGU Fall Meeting
/news/2024/419_1202.htmlText duplicate CSL at the 2024 AGU Fall Meeting
/news/2024/420_1202.htmlIMG-ALT Feature
/news/2024/420_1202.htmlThe New York Times
/news/2024/420_1202.htmlThe U.S. is building an early warning system to detect geoengineering
/news/2024/420_1202.htmlText duplicate The U.S. is building an early warning system to detect geoengineering
https://csl.noaa.gov/Anchor Previous
https://csl.noaa.gov/Anchor Next
https://csl.noaa.gov/groups/Research Programs
https://csl.noaa.gov/groups/csl2/Aerosol Properties & Processes
IMG-ALT CSL2
https://csl.noaa.gov/groups/csl6/Atmospheric Composition & Chemical Processes
IMG-ALT CSL6
https://csl.noaa.gov/groups/csl3/Atmospheric Remote Sensing
IMG-ALT CSL3
https://csl.noaa.gov/groups/csl5/Chemical Processes & Instrument Development
IMG-ALT CSL5
https://csl.noaa.gov/groups/csl8/Chemistry & Climate Processes
IMG-ALT CSL8
https://csl.noaa.gov/groups/csl9/Clouds, Aerosol, & Climate
IMG-ALT CSL9
https://csl.noaa.gov/groups/csl4/Atmospheric Composition Modeling
IMG-ALT CSL4
https://csl.noaa.gov/groups/csl7/Tropospheric Chemistry
IMG-ALT CSL7
https://www.commerce.gov/External Subdomain U.S. Department of Commerce (DoC)
https://www.noaa.gov/External Subdomain National Oceanic and Atmospheric Administration (NOAA)
https://research.noaa.gov/External Subdomain Office of Oceanic and Atmospheric Research (OAR)
https://csl.noaa.gov/Chemical Sciences Laboratory (CSL)
https://csl.noaa.gov/contact.htmlText duplicate Contact Us
https://csl.noaa.gov/survey.htmlProvide Feedback
https://www.linkedin.com/showc...External Subdomain A-TITLE NOAA CSL Linkedin
https://www.facebook.com/NOAAR...External Subdomain A-TITLE NOAA Research Facebook
https://www.instagram.com/noaa...External Subdomain A-TITLE NOAA Research Instagram
https://www.flickr.com/photos/...External Subdomain A-TITLE NOAA CSL Flickr
https://www.youtube.com/user/N...External Subdomain A-TITLE NOAA CSL YouTube
https://csl.noaa.gov/IMG-ALT NOAA CSL
https://www.noaa.gov/privacy.htmlExternal Subdomain Privacy
https://www.noaa.gov/foia/External Subdomain FOIA
https://www.noaa.gov/office-of...External Subdomain Information Quality
https://www.noaa.gov/accessibi...External Subdomain Accessibility
/disclaimer.htmlDisclaimer
https://www.usa.gov/External Subdomain USA.gov

Server configuration

HTTP redirects
(Critically important)
This page redirects to "https://csl.noaa.gov/"
HTTP header
(Important)
The HTML page should be transferred using GZip compression.
No X-Powered HTTP header is sent.
Performance
(Somewhat important)
The page response time is slow (1.21 seconds). The response time should be less than 0.4 seconds. Slow websites are bad for search engine bots and also result in bad user experience.
This page loads 10 CSS files. This may affect the page load time negatively.
This page loads 4 JavaScript files. This may affect the load time negatively.
The file size of the HTML document is fine (24 kB).

HTTP Response Header

NameValue
dateTue, 25 Mar 2025 16:56:26 GMT
serverApache
strict-transport-securitymax-age=31536000; includeSubDomains
accept-rangesbytes
x-frame-optionsALLOW-FROM https://csl.noaa.gov/
transfer-encodingchunked
content-typetext/html; charset=UTF-8
statuscode200
http_versionHTTP/1.1

External factors

This page is referenced by wikipedia.
This website has excellent links from other websites.
This page has backlinks from 3,039 referring domains.
This page has 8,376 backlinks.
This page has backlinks from 852 different ip addresses.

Links from Wikipedia

You can find more links using Wikipedia search

Robots.txt

User-agent: *
Disallow: /acgi-bin
Disallow: /css
Disallow: /cgi-bin
Disallow: /groups/csd3/measurements/data
Disallow: /groups/csd4/forecasts/plots
Disallow: /groups/csd4/metproducts/data
Disallow: /groups/csd4/modeldata/data
Disallow: /groups/csd5/datasets/data
Disallow: /groups/csd6/measurements/data
Disallow: /groups/csd7/measurements/data
Disallow: /groups/csd8/modeldata/data
Disallow: /groups/csd9/datasets/data
Disallow: /groups/csd9/forecasts/data
Disallow: /groups/nav
Disallow: /img
Disallow: /internal/css
Disallow: /internal/nav
Disallow: /js
Disallow: /nav

User-agent: twiceler
Disallow: /

SITEMAP: https://csl.noaa.gov/sitemap.xml

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csl.noaa.gov
NOAA Chemical Sciences Laboratory
NOAA Chemical Sciences Laboratory (CSL): Advancing scientific understanding of the chemical and physical processes that affect Earth's atmospheric composition and climate.

Most important keywords

Following keywords were found. You can check the keyword optimization of this page for each keyword.

KeywordResultRecheck
NOAA Chemical Sciences Laboratory80%Check
Chemical79%Check
Sciences79%Check
Laboratory79%Check
Chemical Sciences Laboratory79%Check
NOAA73%Check
CSL68%Check
Chemical Processes66%Check
atmospheric54%Check
Processes54%Check
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