aqicn.org
Beijing Air Pollution: Real-time Air Quality Index
Last scanned Aug 3, 2026, 7:00 AM · 7 views
Overall score
Fair
Summary
Real-time air pollution index for 100+ countries. This website uses Nginx. SEO is fair (70/100) and accessibility is fair (70/100). Security scores fair (60/100) and performance excellent (100/100). Top issue: Missing canonical link.
Real-time air pollution index for 100+ countries
Top issues to fix
11 issues found · 3 high priority
TLS certificate expires in 4 days
SecurityRenew now (or enable auto-renewal) — an expired certificate blocks visitors with a full-page browser warning.
Missing Content-Security-Policy header
SecurityAdd a CSP to control which sources can run scripts — the strongest single defense against XSS.
Over half of images are missing alt text
AccessibilityAdd alt attributes to images — screen readers depend on them, and they help image SEO.
Missing X-Content-Type-Options header
SecurityAdd X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
Missing X-Frame-Options header
SecurityAdd X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.
Missing canonical link
SEOAdd <link rel="canonical"> so search engines know which URL variant to index.
+5 more issues — details in the sections below.
SEO
5 issue(s) found
Performance
383 ms
Security
HTTPS & header checks
Accessibility
1 issue(s) found
Score history
-2 overall since Jul 26, 2026
- Overall
- 75
- SEO
- 70
- Security
- 60
- Performance
- 100
- Accessibility
- 70
Organization
Company details published in this site's own structured data.
Real-time air pollution index for 100+ countries
Meta tags
- Title
- Beijing Air Pollution: Real-time Air Quality Index
- Description
- Real-time air pollution index for 100+ countries
- Canonical
- Language
- en
- Charset
- UTF-8
- Viewport
- width=device-width
- Robots meta
- Manifest
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- —
- CDN provider
- —
- IP address
- —
- ASN
- —
DNS records
| Type | Value |
|---|---|
| A | — |
| AAAA | — |
| MX | — |
| TXT | — |
| NS | — |
| CAA | — |
| CNAME | — |
| IPv6 support | No |
TLS / SSL certificate
- Version
- TLS 1.2
- Issuer
- Let's Encrypt
- Subject
- aqicn.org
- Valid from
- May 10, 2026
- Valid to
- Aug 8, 2026
- Days until expiry
- 4
- SAN domains
- *.aqicn.org, *.waqi.info, aqicn.org, waqi.info
Security headers
- Strict-Transport-SecurityEnabled
- Content-Security-PolicyMissing
- X-Frame-OptionsMissing
- X-Content-Type-OptionsMissing
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 0 cookie(s) observed
Content & assets
Headings
H1 8 · H2 1 · H3 4
Links
62 internal · 41 external · 20 broken
Images
49 total · 26 missing alt
Scripts / Styles
71 scripts · 4 stylesheets
JS / CSS size
66.9 KB · 26.8 KB
Page size
203 KB
Robots.txt & Sitemap
- robots.txt
- Not found
- Disallow rules
- 0
- sitemap.xml
- Not found
- URLs in sitemap
- 0
SEO issues
- Missing canonical link
- Multiple H1 headings found
- No structured data (JSON-LD) found
- robots.txt not found
- sitemap.xml not found
Accessibility issues
- Over half of images are missing alt text
Scan details
- Requested URL
- https://aqicn.org
- Final URL
- https://aqicn.org/city/beijing/
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 379 ms
- HTML size
- 203 KB
- Redirect chain
- https://aqicn.org → https://aqicn.org/city/beijing/
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Frequently asked questions
- What technology does aqicn.org use?
- aqicn.org is built with jQuery, Google Analytics, Google Ads, Meta Pixel, Nginx.
- Is aqicn.org secure (HTTPS)?
- Yes. aqicn.org uses TLS 1.2 with a certificate issued by Let's Encrypt, valid until Aug 8, 2026.
- Who hosts aqicn.org?
- Hosting provider information for aqicn.org is not available yet.
- What is aqicn.org's SEO score?
- aqicn.org scored 70/100 for SEO in the latest analysis (fair).
- What is aqicn.org's overall website score?
- aqicn.org has an overall SiteGraph score of 75/100, combining SEO, performance, security, and accessibility.
- Has aqicn.org's score changed over time?
- aqicn.org's overall score has declined by 2 points (from 77 to 75) since Jul 26, 2026.
OpenGraph & Twitter Card
OpenGraph
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