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\n

@cyanheads/openaq-mcp-server

\n

Find air-quality monitoring stations, read latest sensor values, and pull historical pollutant series via MCP. STDIO or Streamable HTTP.\n

8 Tools (7 enabled by default) • 2 Resources
\n

\n
\n\n
\n\n[![npm](https://img.shields.io/npm/v/@cyanheads/openaq-mcp-server?style=flat-square&logo=npm&logoColor=white)](https://www.npmjs.com/package/@cyanheads/openaq-mcp-server) [![License](https://img.shields.io/badge/License-Apache%202.0-orange.svg?style=flat-square)](./LICENSE) [![Docker](https://img.shields.io/badge/Docker-ghcr.io-2496ED?style=flat-square&logo=docker&logoColor=white)](https://github.com/users/cyanheads/packages/container/package/openaq-mcp-server) [![MCP SDK](https://img.shields.io/badge/MCP%20SDK-^2.1.0-green.svg?style=flat-square)](https://modelcontextprotocol.io/) [![TypeScript](https://img.shields.io/badge/TypeScript-^7.0.2-3178C6.svg?style=flat-square)](https://www.typescriptlang.org/) [![Bun](https://img.shields.io/badge/Bun-v1.4.2-blueviolet.svg?style=flat-square)](https://bun.sh/)\n\n
\n\n
\n\n[![Install in Claude Desktop](https://img.shields.io/badge/Install_in-Claude_Desktop-D97757?style=for-the-badge&logo=anthropic&logoColor=white)](https://github.com/cyanheads/openaq-mcp-server/releases/latest/download/openaq-mcp-server.mcpb) [![Install in Cursor](https://cursor.com/deeplink/mcp-install-dark.svg)](https://cursor.com/en/install-mcp?name=openaq-mcp-server&config=eyJjb21tYW5kIjoibnB4IiwiYXJncyI6WyIteSIsIkBjeWFuaGVhZHMvb3BlbmFxLW1jcC1zZXJ2ZXIiXSwiZW52Ijp7Ik9QRU5BUV9BUElfS0VZIjoieW91ci1hcGkta2V5In19) [![Install in VS Code](https://img.shields.io/badge/VS_Code-Install_Server-0098FF?style=for-the-badge&logo=visualstudiocode&logoColor=white)](https://vscode.dev/redirect?url=vscode:mcp/install?%7B%22name%22%3A%22openaq-mcp-server%22%2C%22command%22%3A%22npx%22%2C%22args%22%3A%5B%22-y%22%2C%22%40cyanheads%2Fopenaq-mcp-server%22%5D%2C%22env%22%3A%7B%22OPENAQ_API_KEY%22%3A%22your-api-key%22%7D%7D)\n\n[![Framework](https://img.shields.io/badge/Built%20on-@cyanheads/mcp--ts--core-67E8F9?style=flat-square)](https://www.npmjs.com/package/@cyanheads/mcp-ts-core)\n\n
\n\n
\n\n**Public Hosted Server:** [https://openaq.caseyjhand.com/mcp](https://openaq.caseyjhand.com/mcp)\n\n
\n\n---\n\n## Overview\n\nMeasured air quality from the OpenAQ v3 API: physical-sensor observations from government reference monitors and research-grade sensors worldwide. Find monitoring stations, read current values, and pull historical pollutant series from any MCP client. Runs as a stdio process, a local Streamable HTTP server, or the public hosted endpoint above.\n\n### Tools\n\n| Tool | Description |\n|:---|:---|\n| `openaq_find_locations` | Find monitoring stations near a point, in a bounding box, or by country; the location ids the other tools take |\n| `openaq_get_readings` | Latest value for every sensor at a station, labeled with its pollutant and unit |\n| `openaq_get_measurements` | Historical series for one pollutant at one station, raw or rolled up hourly/daily |\n| `openaq_list_parameters` | Pollutant catalog with canonical units; maps a pollutant and unit to its parameter id |\n| `openaq_list_countries` | Country coverage: data span and the parameters measured in each |\n| `openaq_dataframe_describe` | List the tables and columns staged on a DataCanvas |\n| `openaq_dataframe_query` | Run a read-only SQL `SELECT` over staged measurement series |\n| `openaq_dataframe_drop` | Delete a complete staged canvas; opt-in with `OPENAQ_ENABLE_CANVAS_DROP=true` |\n\n### Resources\n\n| Resource | Description |\n|:---|:---|\n| `openaq://location/{locationId}` | Metadata for one station: coordinates, provider, sensors with units, data span |\n| `openaq://parameters` | Full pollutant and unit catalog |\n\nBoth resources mirror tool output, so tool-only clients lose nothing.\n\n## Capability reference\n\n### `openaq_find_locations` tool\n\n- Scope by `coordinates` with `radius` (metres, 1–25000, default 12000), `bbox`, and/or `iso` (a code from `openaq_list_countries`); at least one is required, and `coordinates` and `bbox` exclude each other. `parametersId`, `monitor`, `mobile`, and `providersId` narrow further; up to 100 stations per page (`limit`, default 20), 1-based `page`\n- Each station carries `id`, `distanceMeters` (coordinate search only), `provider`/`providerId`, `isMonitor`/`isMobile`, its `parameters` with units, and the `datetimeFirst`/`datetimeLast` span; `coordinates`, `country`, and `provider` are null when OpenAQ lists none\n- `totalCount` counts stations through the current page and is a floor when `totalCountIsLowerBound` is set; no match fails as `no_locations_found`, a page past the end as `page_exhausted`\n\n---\n\n### `openaq_get_readings` tool\n\n- A `locationId`, or `coordinates` plus `parametersId` to resolve the nearest station within 25 km that measures it (compared across up to 1,000 matching stations; a full 1,000 adds a `notice`); with `locationId`, `parametersId` optionally filters to one parameter\n- One reading per sensor with `value`, `unit`, `sensorId`, and `datetimeUtc`/`datetimeLocal`, plus the station's `provider`, `providerId`, `timezone`, and `datetimeLast`\n- Misses are typed: `location_not_found`, `parameter_not_at_location` (with the station's `available` ids), `no_station_near_coordinates`, `no_recent_values`\n\n---\n\n### `openaq_get_measurements` tool\n\n- Requires `locationId` and `parametersId`; `datetimeFrom`/`datetimeTo` accept UTC timestamps or station-local `YYYY-MM-DD` dates (UTC days when the station has no timezone). `aggregation` is `raw` (default), `hourly`, or `daily`; up to 5,000 rows per call\n- Returns `series`, `sensorId`, `pulledCount`, `pullComplete`, `effectiveRange`, and station `provider`, `providerId`, and `timezone`. `totalCount` is a floor when `totalCountIsLowerBound` is set; rollups add summary statistics, `gapCount`, the first 20 missing intervals as `gaps`, and a notice when edge buckets are clipped\n- Past 100 rows, `series` is a preview (`truncated`) and the pulled rows stage on a DataCanvas as `measurements_` (`canvasId`, `tableName`) when `CANVAS_PROVIDER_TYPE=duckdb`; a supplied `canvas_id` stages onto that canvas at any size. One table per sensor: a second sensor adds a table to join against, and re-staging the same sensor overwrites its earlier series\n\n---\n\n### `openaq_list_parameters` tool\n\n- Optional case-insensitive `query` over code, display name, and description; `pollutantsOnly` drops meteorological and particle-count channels\n- Rows carry `id`, `name`, `displayName`, `unit`, and `description`; one pollutant can appear under several ids by unit (CO is 4 in µg/m³, 8 in ppm, 102 in ppb)\n\n---\n\n### `openaq_list_countries` tool\n\n- Optional `query` (a two-letter value matches an ISO 3166-1 alpha-2 code first; otherwise code or name substrings match) and `parametersId`; up to 100 per page (`limit`, default 20), 1-based `page`\n- Rows carry `code` (the `iso` value for `openaq_find_locations`), `name`, the `datetimeFirst`/`datetimeLast` span, and the `parameters` measured anywhere in the country; `totalCount` is the full filtered count\n\n---\n\n### `openaq_dataframe_describe` tool\n\n- Takes a `canvas_id` from `openaq_get_measurements` and returns each staged table's `name`, `rowCount`, and `columns`. Call it before `openaq_dataframe_query`: the staged table is flat (`min`, `sd`) while the inline `series` nests those under `summary`\n- Fails as `canvas_unavailable` unless `CANVAS_PROVIDER_TYPE=duckdb`, or `canvas_not_found` for an unknown or expired id\n\n---\n\n### `openaq_dataframe_query` tool\n\n- A `canvas_id` and one read-only `SELECT`; writes, DDL, and file/network table functions are rejected\n- At most 200 rows per response, with `truncated` set when the cap cut the result; page with `ORDER BY` plus `LIMIT`/`OFFSET`\n- Fails as `canvas_unavailable`, `canvas_not_found`, or `missing_table`\n\n---\n\n### `openaq_dataframe_drop` tool\n\n- Registered only with `OPENAQ_ENABLE_CANVAS_DROP=true`; calls fail as `canvas_unavailable` unless `CANVAS_PROVIDER_TYPE=duckdb`. When disabled, the HTTP landing page shows the enable hint and `tools/list` omits the tool\n- Takes a `canvas_id` and deletes that whole canvas, including all staged tables. Other agents sharing the id lose access; OpenAQ's source data is unaffected\n- Returns the requested `canvasId` and `dropped`: true when deleted, false when no reachable canvas exists. With authentication off, callers share a tenant: anyone holding an id can delete its canvas when enabled\n\n---\n\n### `openaq://location/{locationId}` resource\n\n- `application/json`: name, locality, timezone, country, provider, `isMonitor`/`isMobile`, coordinates, `sensors` (each with `parameterId` and `unit`), and the `datetimeFirst`/`datetimeLast` span\n- `locationId` comes from `openaq_find_locations`; cached 5 minutes\n\n---\n\n### `openaq://parameters` resource\n\n- `application/json` catalog, the same rows as an unfiltered `openaq_list_parameters`\n- Cached 1 hour\n\n## Features\n\nBuilt on [`@cyanheads/mcp-ts-core`](https://github.com/cyanheads/mcp-ts-core): stdio and Streamable HTTP transports, pluggable auth (`none` / `jwt` / `oauth`), swappable storage (`in-memory`, `filesystem`, `Supabase`, `Cloudflare KV/R2/D1`), structured logging with optional OpenTelemetry tracing.\n\nOpenAQ-specific:\n\n- One typed client over the OpenAQ v3 REST API: `X-API-Key` auth, retry with backoff, and typed upstream failures (`invalid_api_key`, `rate_limited`, `upstream_timeout`, `upstream_error`) on every OpenAQ call\n- Hides the v3 location → sensor → measurement hierarchy: readings join the latest feed to the station's sensor map, and measurements resolve a station plus parameter to its sensor\n- Coordinates and bbox corners are range-checked and contradictory search scopes rejected before any request reaches OpenAQ\n- Large measurement series stage on a DataCanvas for read-only DuckDB SQL, one table per sensor, so two series on one `canvas_id` can be joined\n\nAgent-friendly output:\n\n- Measured, not modeled: a search with no station fails as `no_locations_found` or `no_station_near_coordinates`, stated as no coverage rather than clean air\n- Units travel with every value and are never converted; `parametersId` selects pollutant and unit together\n- Freshness and truncation are explicit: per-value timestamps and `datetimeLast`, and `totalCount` / `truncated` / `notice` on capped results\n\n## Getting started\n\n### Public Hosted Instance\n\nA public instance is available at `https://openaq.caseyjhand.com/mcp` — no installation required. Point any MCP client at it via Streamable HTTP:\n\n```json\n{\n \"mcpServers\": {\n \"openaq-mcp-server\": {\n \"type\": \"streamable-http\",\n \"url\": \"https://openaq.caseyjhand.com/mcp\"\n }\n }\n}\n```\n\n### Self-Hosted / Local\n\nAdd the following to your MCP client configuration file.\n\n```json\n{\n \"mcpServers\": {\n \"openaq-mcp-server\": {\n \"type\": \"stdio\",\n \"command\": \"bunx\",\n \"args\": [\"@cyanheads/openaq-mcp-server@latest\"],\n \"env\": {\n \"MCP_TRANSPORT_TYPE\": \"stdio\",\n \"OPENAQ_API_KEY\": \"your-api-key\"\n }\n }\n }\n}\n```\n\nOr with npx (no Bun required):\n\n```json\n{\n \"mcpServers\": {\n \"openaq-mcp-server\": {\n \"type\": \"stdio\",\n \"command\": \"npx\",\n \"args\": [\"-y\", \"@cyanheads/openaq-mcp-server@latest\"],\n \"env\": {\n \"MCP_TRANSPORT_TYPE\": \"stdio\",\n \"OPENAQ_API_KEY\": \"your-api-key\"\n }\n }\n }\n}\n```\n\nOr with Docker:\n\n```json\n{\n \"mcpServers\": {\n \"openaq-mcp-server\": {\n \"type\": \"stdio\",\n \"command\": \"docker\",\n \"args\": [\n \"run\", \"-i\", \"--rm\",\n \"-e\", \"MCP_TRANSPORT_TYPE=stdio\",\n \"-e\", \"OPENAQ_API_KEY=your-api-key\",\n \"ghcr.io/cyanheads/openaq-mcp-server:latest\"\n ]\n }\n }\n}\n```\n\nAdd `\"CANVAS_PROVIDER_TYPE\": \"duckdb\"` to `env` to enable DataCanvas SQL over large measurement series.\n\nFor Streamable HTTP, set the transport and start the server:\n\n```sh\nMCP_TRANSPORT_TYPE=http MCP_HTTP_PORT=3010 OPENAQ_API_KEY=your-api-key bun run start:http\n# Server listens at http://localhost:3010/mcp\n```\n\n### Prerequisites\n\n- [Bun v1.4.0](https://bun.sh/) or higher (or Node.js v24+).\n- A free OpenAQ v3 API key from an [OpenAQ Explorer](https://explore.openaq.org/) account.\n\n### Installation\n\n1. **Clone the repository:**\n\n```sh\ngit clone https://github.com/cyanheads/openaq-mcp-server.git\n```\n\n2. **Navigate into the directory:**\n\n```sh\ncd openaq-mcp-server\n```\n\n3. **Install dependencies:**\n\n```sh\nbun install\n```\n\n4. **Configure environment:**\n\n```sh\ncp .env.example .env\n# edit .env and set OPENAQ_API_KEY\n```\n\n## Configuration\n\n| Variable | Description | Default |\n|:---|:---|:---|\n| `OPENAQ_API_KEY` | **Required.** OpenAQ v3 API key, sent as the `X-API-Key` header. | — |\n| `OPENAQ_API_BASE_URL` | OpenAQ v3 API base URL, for a proxy or test mirror. | `https://api.openaq.org/v3` |\n| `CANVAS_PROVIDER_TYPE` | `duckdb` stages large measurement series for SQL via the dataframe tools; without it, large series return a preview plus a notice. The `.mcpb` bundle ships without DuckDB, so use npm, npx, or Docker for canvas work. | `none` |\n| `OPENAQ_ENABLE_CANVAS_DROP` | Enable `openaq_dataframe_drop` to delete entire canvases and release their resources. Requires DuckDB; an id shared with another agent grants deletion access within the same tenant. | `false` |\n| `MCP_TRANSPORT_TYPE` | Transport: `stdio` or `http`. | `stdio` |\n| `MCP_HTTP_PORT` | HTTP server port. | `3010` |\n| `MCP_SESSION_MODE` | HTTP session mode: `stateless`, `stateful`, or `auto`. Overrides the server's explicit stateless posture; `auto` resolves to stateful. | `stateless` |\n| `MCP_AUTH_MODE` | Authentication: `none`, `jwt`, or `oauth`. | `none` |\n| `MCP_LOG_LEVEL` | Log level (`debug`, `info`, `warning`, `error`, etc.). | `info` |\n| `OTEL_ENABLED` | Enable [OpenTelemetry](https://github.com/cyanheads/mcp-ts-core/tree/main/docs/telemetry). | `false` |\n| `OTEL_EXPORTER_OTLP_ENDPOINT` | OTLP base URL; traces use `/v1/traces` and metrics use `/v1/metrics`. Signal-specific endpoints override it. | — |\n| `OTEL_EXPORTER_OTLP_LOGS_ENDPOINT` | Opt into OTLP log export with a full endpoint URL. The base endpoint never enables logs. | — |\n| `LOG_TOOL_FAILURE_PAYLOADS` | Log failed calls' arguments and results. Redacts by key name only; secrets in free-form values remain. | `false` |\n| `LOG_TOOL_FAILURE_PAYLOAD_MAX_BYTES` | UTF-8 byte cap per logged failure payload. | `16384` |\n\nSee [`.env.example`](./.env.example) for the full list of optional overrides.\n\n## Running the server\n\n### Local development\n\n- **Build and run:**\n\n ```sh\n bun run rebuild\n bun run start:http # or start:stdio\n ```\n\n- **Run checks and tests:**\n\n ```sh\n bun run devcheck # Lint, format, typecheck, security, changelog sync\n bun run test # Vitest test suite\n bun run lint:mcp # Validate MCP definitions against spec\n ```\n\n### Docker\n\n```sh\ndocker build -t openaq-mcp-server .\ndocker run --rm -e OPENAQ_API_KEY=your-api-key -p 3010:3010 openaq-mcp-server\n```\n\nThe image defaults to HTTP transport, stateless session mode, and logs to `/var/log/openaq-mcp-server`. DuckDB ships in the image, so DataCanvas works once `CANVAS_PROVIDER_TYPE=duckdb` is set. OpenTelemetry peer dependencies are installed by default; build with `--build-arg OTEL_ENABLED=false` to omit them.\n\n## Project structure\n\n| Directory | Purpose |\n|:---|:---|\n| `src/index.ts` | `createApp()` entry point: registers tools and resources, wires the service and canvas. |\n| `src/config` | Server-specific environment variable parsing and validation with Zod. |\n| `src/mcp-server/tools` | Tool definitions (`definitions/*.tool.ts`) and shared input, error, and format helpers (`shared/`). |\n| `src/mcp-server/resources` | Resource definitions (`definitions/*.resource.ts`). |\n| `src/services` | OpenAQ v3 client and domain types (`openaq/`), plus the DataCanvas accessor. |\n| `tests/` | Unit and integration tests mirroring `src/`. |\n\n## Development guide\n\nSee [`CLAUDE.md`](./CLAUDE.md) / [`AGENTS.md`](./AGENTS.md) for development guidelines and architectural rules. The short version:\n\n- Handlers throw, framework catches — catch only to map a failure to a declared error reason or to keep a partial result\n- Use `ctx.log` for request-scoped logging, `ctx.state` for tenant-scoped storage\n- Register new tools and resources in the `createApp()` arrays\n- Wrap the OpenAQ API: validate raw → normalize to the domain type → return the output schema; surface units verbatim and never fabricate missing fields\n\n## Contributing\n\nIssues are welcome. Run checks and tests before submitting:\n\n```sh\nbun run devcheck\nbun run test\n```\n\n## License\n\nApache-2.0 — see [LICENSE](./LICENSE) for details.\n\nData comes from the [OpenAQ](https://openaq.org) platform, and attribution to OpenAQ is required when using this server's output ([Terms of Use](https://docs.openaq.org/about/terms)). OpenAQ aggregates measurements from government agencies, research institutions, and other networks, each of which may set its own attribution or licensing terms. The `provider` field on `openaq_find_locations`, `openaq_get_readings`, and `openaq_get_measurements` results and the `openaq://location/{locationId}` resource names the originating network; review and follow the terms of any provider whose data you use.\n","readmeFilename":"README.md"}