Controller (Art. 13 GDPR)

Hosting & Server Logs

This website is hosted by Vercel Inc., 340 Pine Street, Suite 801, San Francisco, CA 94104, USA. On every page request, Vercel processes technical access data (IP address, timestamp, requested URL, browser and device information) in the form of server logs. This data is technically necessary to provide and secure the operation of the site.

Legal basis: Art. 6(1)(f) GDPR (legitimate interest in secure and stable operation). Data is deleted after a maximum of 30 days.

Vercel Web Analytics

This website uses Vercel Web Analytics to evaluate page views. No cookies are set and no personal data such as IP addresses are permanently stored. Vercel only collects aggregated, non-traceable usage statistics (pages visited, country of origin, browser type).

Legal basis: Art. 6(1)(f) GDPR (legitimate interest in improving the service). As no personal data is processed, no consent is required. More information: vercel.com/docs/analytics/privacy-policy.

Air Quality Data (OpenAQ)

The air quality data displayed comes from OpenAQ (openaq.org), a non-profit organisation based in the USA. Data requests are made exclusively server-side — your IP address is not transmitted to OpenAQ. OpenAQ provides publicly available measurement data; their terms of use can be found at openaq.org/developers.

Third-Country Transfers

Vercel Inc. is based in the USA. The transfer of personal data (server logs) to the USA is based on standard contractual clauses (Art. 46(2)(c) GDPR) and the EU–US Data Privacy Framework. Vercel is certified under the Data Privacy Framework.

Retention Period

Server logs are automatically deleted by Vercel after a maximum of 30 days. Vercel Analytics stores only aggregated, non-personal statistics with no defined deletion period.

Your Rights (Art. 15–21 GDPR)

You have the right at any time to:

• Access your stored data (Art. 15)
• Rectification of inaccurate data (Art. 16)
• Erasure of your data, provided no retention obligation applies (Art. 17)
• Restriction of processing (Art. 18)
• Data portability (Art. 20)
• Object to processing based on legitimate interests (Art. 21)

To exercise your rights, please contact the controller listed above by email.