Verifying against the live site and live WHOIS/DNS…
Common questions
Is airnow.gov legit or a scam?
airnow.gov was registered Oct 1, 2003 (23 years old), per public registration records. AboutUs doesn't label sites "legit" or "a scam": this page lists the dated registration, DNS, HTTPS, mail-authentication and safety checks we could verify, each with its source, so you can decide for yourself.
Who owns airnow.gov?
Nobody has completed AboutUs's owner verification for airnow.gov. That's true of most sites here — it isn't itself a warning sign.
When was airnow.gov registered?
airnow.gov's registration dates to Oct 1, 2003 (23 years old), per public registration records. get.gov is the registrar on record today.
Correct a description, link or other detail. Submissions are reviewed before publication.
0 of 2 safety checks passed (Nov 15, 2026).
Lifeline · airnow.gov over time
Checked in the last 30 daysOlder, dated recordFrom registration records
Registered 23 years ago · on AboutUs since 2006 · 1 registrar change since Jul 24, 2024 · no registrant change on record since 2024 · last checked Nov 8, 2026.
Registration
RegisteredOct 1, 2003airnow.gov was registered on Oct 1, 2003.Source: RDAP, fetched Nov 8, 2026
AboutUs record
AboutUs wiki pageAboutUs wiki pageSep 27, 2006 – Apr 3, 2014An AboutUs wiki page described airnow.gov from Sep 27, 2006 to Apr 3, 2014 (3 edits).Source: AboutUs wiki archive, 2006–2023
Registrar
Cybersecurity and Infrastructure Security AgencyJul 24, 2024 – Oct 9, 2024Registrar Cybersecurity and Infrastructure Security Agency in the WHOIS and RDAP records held for airnow.gov, from Jul 24, 2024 to Oct 9, 2024.Source: WHOIS / RDAP archive (who.is)get.gov
Registrant
Registrant recordsJul 24, 2024 – Jun 30, 2026Registration records for airnow.gov are held from Jul 24, 2024 to Jun 30, 2026 (30 records). None shows a change of registrant. Privacy-service and redaction changes, renames of the same organization and new contacts at it are not counted.Source: WHOIS / RDAP archive (who.is); counted by registrant name and organization only
No registrant changes recorded, 2024–2026
Zone file
Nameservers: epa.govNameservers: epa.govJul 24, 2024 – Jun 30, 2026Registration records listed epa.gov nameservers (dcns1.epa.gov, dcns2.epa.gov, nccns1.epa.gov…) for airnow.gov from Jul 24, 2024 to Jun 30, 2026.Source: From registration records (WHOIS / RDAP archive, who.is)
Certificate
Let's EncryptApr 3, 2026 – Nov 15, 2026Let's Encrypt issued 37 certificates for airnow.gov from Apr 3, 2026, the latest valid until Feb 2, 2027.Source: Certificate Transparency logs (AboutUs's own certificate-log reader)DigiCert Inc
20052010201520202025Apr ’26← last 12 months, drawn wider
Every dated fact on this lifeline (11)
Oct 1, 2003Registration: airnow.gov was registered on Oct 1, 2003.Source: RDAP, fetched Nov 8, 2026
Jul 1, 2006AboutUs record: “The Air Quality Index (AQI) is an index for reporting daily air quality. It tells you how clean or polluted your outdoor air is, and what associated health effects might be a concern for you. The AQI focuses on health e…”Source: AboutUs wiki archive, 2006
Sep 27, 2006 – Apr 3, 2014AboutUs record: An AboutUs wiki page described airnow.gov from Sep 27, 2006 to Apr 3, 2014 (3 edits).Source: AboutUs wiki archive, 2006–2023
Jul 24, 2024 – Oct 9, 2024Registrar: Registrar Cybersecurity and Infrastructure Security Agency in the WHOIS and RDAP records held for airnow.gov, from Jul 24, 2024 to Oct 9, 2024.Source: WHOIS / RDAP archive (who.is)
Jul 24, 2024 – Jun 30, 2026Registrant: Registration records for airnow.gov are held from Jul 24, 2024 to Jun 30, 2026 (30 records). None shows a change of registrant. Privacy-service and redaction changes, renames of the same organization and new contacts at it are not counted.Source: WHOIS / RDAP archive (who.is); counted by registrant name and organization only
Said about itself in 2006
Jul 1, 2006
“The Air Quality Index (AQI) is an index for reporting daily air quality. It tells you how clean or polluted your outdoor air is, and what associated health effects might be a concern for you. The AQI focuses on health e…”
Source: AboutUs wiki archive, 2006
Current AboutUs recordJun 25, 2026 – Nov 8, 2026 (latest)Authority and Safety last refreshed Nov 8, 2026.Source: AboutUs checks
get.govJan 12, 2025 – Nov 14, 2026 (latest)Registrar get.gov (IANA 8888888) in the registration data recorded, first on Jan 12, 2025 and most recently on Nov 14, 2026.Source: RDAP, fetched Nov 8, 2026
Seen in the .gov zone fileJul 28, 2026 – Jul 29, 2026 (latest)First seen in the .gov zone file records AboutUs holds on Jul 28, 2026; latest sighting Jul 29, 2026.Source: ICANN CZDS zone file
Sep 21, 2026 – Nov 15, 2026
DigiCert Inc issued 1 certificate for airnow.gov from Sep 21, 2026, the latest valid until Apr 7, 2027.
Source: Certificate Transparency logs (AboutUs's own certificate-log reader)
Jul 24, 2024 – Jun 30, 2026
Zone file: Registration records listed epa.gov nameservers (dcns1.epa.gov, dcns2.epa.gov, nccns1.epa.gov…) for airnow.gov from Jul 24, 2024 to Jun 30, 2026.Source: From registration records (WHOIS / RDAP archive, who.is)
Jan 12, 2025 – Nov 14, 2026Registrar: Registrar get.gov (IANA 8888888) in the registration data recorded, first on Jan 12, 2025 and most recently on Nov 14, 2026.Source: RDAP, fetched Nov 8, 2026
Apr 3, 2026 – Nov 15, 2026Certificate: Let's Encrypt issued 37 certificates for airnow.gov from Apr 3, 2026, the latest valid until Feb 2, 2027.Source: Certificate Transparency logs (AboutUs's own certificate-log reader)
Jun 25, 2026 – Nov 8, 2026AboutUs record: Authority and Safety last refreshed Nov 8, 2026.Source: AboutUs checks
Jul 28, 2026 – Jul 29, 2026Zone file: First seen in the .gov zone file records AboutUs holds on Jul 28, 2026; latest sighting Jul 29, 2026.Source: ICANN CZDS zone file
Sep 21, 2026 – Nov 15, 2026Certificate: DigiCert Inc issued 1 certificate for airnow.gov from Sep 21, 2026, the latest valid until Apr 7, 2027.Source: Certificate Transparency logs (AboutUs's own certificate-log reader)
Registered 2003 · AboutUs could not get a response over HTTPS when it checked (Nov 15, 2026)
AIRNow provides daily Air Quality Index (AQI) data and forecasts for five major air pollutants regulated under the Clean Air Act, including ozone, particle pollution, carbon monoxide, sulfur dioxide, and nitrogen dioxide. The service helps the public understand current outdoor air quality and associated health effects. EPA calculates and distributes the AQI through real-time monitoring and forecasting tools.
Add a public A or AAAA record so the domain resolves.
HTTPS (failed)
Make sure the site responds over HTTPS with a valid certificate.
AboutUs has not vetted this site. Everything below is what we could measure automatically. Anything you do on the site — paying, sharing personal details, downloading — is between you and the site, not AboutUs.
Current facts
Latest available measurements; dated entries retain their dates. These are measurements, not an endorsement of the site.
latest result
Domain registered Oct 1, 2003 — 23 years old.
latest result
Registrar on record: get.gov — unchanged since AboutUs began tracking (Sep 29, 2026).
Authority 55/100— ahead of 55% of the August 2026 scored sampleSome caution flags
Why this authority score
55 is a percentile: higher than 55% of sites we score.
How it's calculated
Prominence (Tranco rank #22,827)+7
Verified continuity: 23.1 years (RDAP registration)+10
Security & email hygiene+2
Calibration adjustment (published map)+10
Model score: 29/99 — what these reason lines add up to.
Published Authority (percentile): 55/100 — this site's rank against the August 2026 scored sample. Public Authority is capped at 99.
Safety evidence
No unexpired threat-feed result; name-similarity check available (recorded about 6 days ago); 3/3 transport and email checks available (oldest recorded about 6 days ago). This is evidence coverage, not a probability that a website is safe.
Recorded HTTPS check did not confirm a valid connection
What airnow.gov said about itself, 2006
Quoted from the site's AboutUs wiki page in each year it changed (1 version). These are the page's own words at the time, not AboutUs's assessment. New words · dropped words
2006
The Air Quality Index (AQI) is an index for reporting daily air quality. It tells you how clean or polluted your outdoor air is, and what associated health effects might be a concern for you. The AQI focuses on health effects you may experience within a few hours or days after breathing polluted air.
Site history
Dated record — historical facts always carry their date; self-description below is the 2014 record.
2003
Domain registered (Oct 1, 2003).
2006
First tracked by AboutUs (Sep 27, 2006); profile edited 3 times through 2014.
2014
Self-description at the time:
“AirNow.gov is this is the link related to airnow govt”