Free, keyless real-time air quality (US AQI plus PM2.5, PM10, ozone, NO2, SO2, CO) for any city.
Until 2026-09-26 this record combined several servers published from one repository. The others now have records of their own: Postal Lookup MCP, Lulu Registry MCP, domain-rdap-mcp, lulu-crypto-price-mcp, holidays-mcp, air-quality-mcp, Domain RDAP MCP, fx-converter-mcp, Weather MCP, postal-lookup-mcp, Crypto Price MCP, FX Converter MCP, Holidays MCP. Checks from before that date include them.
Wellknown found it in public sources; nobody has proven control of it yet. Claiming takes one click if the repository is under your GitHub account, or a small file on your domain otherwise. Verified owners get the badge, 15-minute checks, status alerts, edits that outrank crawled data, and a ranking boost.
Agents can do it too: POST https://wellknown.network/api/v1/claims with {"agent":"air-quality-mcp","method":"well_known_file"} — machine-readable steps at claim.json, guide at /docs/claim.
Everything here was measured by our prober or read from a registry. Nothing is self-reported.
| when | check | result | http | latency | detail |
|---|---|---|---|---|---|
| 3 h ago | mcp initialize | ok | 200 | 112 ms | server air-quality 3.4.4 · protocol 2025-06-18 · 1 tools |
| 9 h ago | mcp initialize | ok | 200 | 123 ms | server air-quality 3.4.4 · protocol 2025-06-18 · 1 tools |
| 15 h ago | mcp initialize | ok | 200 | 116 ms | server air-quality 3.4.4 · protocol 2025-06-18 · 1 tools |
| 22 h ago | mcp initialize | ok | 200 | 115 ms | server air-quality 3.4.4 · protocol 2025-06-18 · 1 tools |
| 28 h ago | mcp initialize | ok | 200 | 120 ms | server air-quality 3.4.4 · protocol 2025-06-18 · 1 tools |
| 35 h ago | mcp initialize | ok | 200 | 132 ms | server air-quality 3.4.4 · protocol 2025-06-18 · 1 tools |
| 2 d ago | mcp initialize | ok | 200 | 135 ms | server air-quality 3.4.4 · protocol 2025-06-18 · 1 tools |
| 2 d ago | mcp initialize | ok | 200 | 144 ms | server air-quality 3.4.4 · protocol 2025-06-18 · 1 tools |
| 2 d ago | mcp initialize | ok | 200 | 116 ms | server air-quality 3.4.4 · protocol 2025-06-18 · 1 tools |
| 3 d ago | mcp initialize | ok | 200 | 112 ms | server air-quality 3.4.4 · protocol 2025-06-18 · 1 tools |
Attributed to the source that supplied each field. Treated as claims, not facts.
No long description beyond the summary.
Mapped onto the structured taxonomy from declared text and observed tool names. Confidence shown for derived entries.
Every source is kept verbatim. Field changes are logged as events.