Is the UK Data: UK air quality (Defra) MCP server safe?

No scan can promise that. What its definitions show: 7 tools, 6 of which can change, send or delete something, and 0 findings from fixed checks. Allow the reads, ask before each change, and deny the deletes; the permissions block on this page does that.

Can the UK Data: UK air quality (Defra) MCP server delete data?

No tool is classed as destructive: going by their definitions, none of them deletes, cancels or revokes anything.

Can the UK Data: UK air quality (Defra) MCP server do things that cannot be undone?

No tool is classed as irreversible: none of them sends, pays, publishes or merges, going by their definitions.

What tools does the UK Data: UK air quality (Defra) MCP server have?

7 tools: 6 write, 1 read. no2_level_near, pm25_level_near, pm10_level_near, ozone_level_near, air_quality_index_near, air_pollutant_history and air_quality_stations_near.

Does the UK Data: UK air quality (Defra) MCP server need sign-in or OAuth?

Its remote endpoint listed its tools to an anonymous client, without sign-in.

Does the UK Data: UK air quality (Defra) MCP server send data to outside services?

None of its tools sends, posts or publishes, or takes a recipient, channel or URL.

Has the UK Data: UK air quality (Defra) MCP server changed its tools?

Not since anlyon.dev started tracking it. Last scanned Nov 7, 2026.

UK Data: UK air quality (Defra) MCP server

uk.co.reliness/air-qualityreliness.co.ukstreamable-httpv1.5.0Scanned 8 days ago

Live UK air pollution from Defra monitors: NO2, PM2.5, PM10, ozone and the Daily Air Quality Index

7 tools: 6 change things and 1 only read.

Reads private data · 0
Reads text others write · 7
Can send data out · 0
No findings

Tools listed without sign-in. Remote posture

With Anlyon

6 tools here change things. Govern them.

Anlyon lists the tools and adopts none.
Each tool you adopt gets approvals and receipts.
Your agent never holds the key.

Govern this server →

A tool your agent calls directly is not routed through Anlyon and is not governed by it. anlyon.dev only lists and labels, and these labels are the same either way.

What the UK Data: UK air quality (Defra) MCP server can do

The UK Data: UK air quality (Defra) MCP server is published by reliness.co.uk, a domain the MCP Registry verified. It has 7 tools. It can create or change data (6 tools: no2_level_near, pm25_level_near, pm10_level_near, ozone_level_near and 2 more), but cannot delete data. 1 tool only reads.

7 tools bring in text other people can write (air_quality_stations_near, no2_level_near, pm25_level_near and 4 more).

None of the fixed checks matched anything in its tool definitions. That is not a safety guarantee.

Its remote endpoint lists its tools without sign-in.

Last scanned Nov 7, 2026, version 1.5.0.

Tools

Grouped by what each tool does, most consequential first. Open one for its reasons and full description; descriptions are the publisher's own words.

7 tools

Changes things 6Creates or changes something that can be changed back.Claude Code: ask

air_pollutant_historyHourly readings of one pollutant at one Defra UK-AIR monitor over a period of 1 to 168 hours (7 days): up to 100 hourly rows are shown (the latest), while the minimum, maximum, mea…Reads text others writeNo findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
What it can reach
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
Description, as the server wrote it
Hourly readings of one pollutant at one Defra UK-AIR monitor over a period of 1 to 168 hours (7 days): up to 100 hourly rows are shown (the latest), while the minimum, maximum, mean, peak hour and daily means cover the whole period. For evidence and comparisons: councillors, campaigners, schools, journalists and researchers asking "when was pollution highest this week". Takes a timeseries_id or station_id from the other air quality tools. Data are provisional; this is not the ratified long-term archive. (cost: 1 credit)
Annotations the server declares
- title: air pollutant history
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
air_quality_index_nearOne answer to "what is the air quality near me today": the overall UK Daily Air Quality Index (1-10, Low, Moderate, High or Very High) with health advice, calculated from the lates…Reads text others writeNo findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
What it can reach
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
Description, as the server wrote it
One answer to "what is the air quality near me today": the overall UK Daily Air Quality Index (1-10, Low, Moderate, High or Very High) with health advice, calculated from the latest NO2, ozone, PM2.5 and PM10 measurements at the nearest working Defra AURN monitors, and which pollutant drives it. Calculated with the Defra DAQI bands and averaging periods; it is not Defra's own published index or the air pollution forecast, and pollutants may come from different nearby sites. (cost: 1 credit)
Annotations the server declares
- title: air quality index near
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
no2_level_nearLatest hourly nitrogen dioxide (NO2) reading in ug/m3 at the nearest working Defra AURN monitor, with its Daily Air Quality Index band (1-10, Low to Very High) and health advice.Reads text others writeNo findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
What it can reach
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
Description, as the server wrote it
Latest hourly nitrogen dioxide (NO2) reading in ug/m3 at the nearest working Defra AURN monitor, with its Daily Air Quality Index band (1-10, Low to Very High) and health advice. NO2 is mainly traffic and diesel pollution, the UK's headline roadside pollutant, so this answers "how bad is the traffic pollution near me right now" for cyclists, parents on the school run and people with asthma. Source: Defra UK-AIR. A single monitor can be several km away and not represent your street. (cost: 1 credit)
Annotations the server declares
- title: no2 level near
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
ozone_level_nearLatest hourly ground-level ozone (O3) reading in ug/m3 at the nearest working Defra AURN monitor, plus its 8-hour mean and the Daily Air Quality Index band and health advice that m…Reads text others writeNo findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
What it can reach
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
Description, as the server wrote it
Latest hourly ground-level ozone (O3) reading in ug/m3 at the nearest working Defra AURN monitor, plus its 8-hour mean and the Daily Air Quality Index band and health advice that mean gives. Ozone peaks on hot sunny days (summer smog), often higher in the countryside than in cities, so this suits runners and people with lung conditions in heatwaves. Source: Defra UK-AIR. Not a forecast. (cost: 1 credit)
Annotations the server declares
- title: ozone level near
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
pm10_level_nearLatest hourly coarse particulate (PM10) reading in ug/m3 at the nearest working Defra AURN monitor, plus its 24-hour mean and the Daily Air Quality Index band and health advice tha…Reads text others writeNo findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
What it can reach
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
Description, as the server wrote it
Latest hourly coarse particulate (PM10) reading in ug/m3 at the nearest working Defra AURN monitor, plus its 24-hour mean and the Daily Air Quality Index band and health advice that mean gives. Useful for Saharan dust episodes, construction and road dust. Source: Defra UK-AIR. Not a forecast; one monitor may not represent your street. (cost: 1 credit)
Annotations the server declares
- title: pm10 level near
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
pm25_level_nearLatest hourly fine particulate (PM2.5) reading in ug/m3 at the nearest working Defra AURN monitor, plus its 24-hour mean and the Daily Air Quality Index band and health advice that…Reads text others writeNo findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
What it can reach
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
Description, as the server wrote it
Latest hourly fine particulate (PM2.5) reading in ug/m3 at the nearest working Defra AURN monitor, plus its 24-hour mean and the Daily Air Quality Index band and health advice that mean gives. PM2.5 is the pollutant most linked to health effects (smoke, wood burners, traffic, bonfire night), so this suits asthma and COPD sufferers, runners and parents. Source: Defra UK-AIR. Not a forecast; one monitor may not represent your street. (cost: 1 credit)
Annotations the server declares
- title: pm25 level near
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true

Only reads 1Looks things up and changes nothing.Show 1 read-only tool

air_quality_stations_nearLists the official Defra AURN air quality monitoring sites near a UK point, nearest first, with the headline pollutants each currently measures (NO2, ozone, PM2.5, PM10).Reads text others writeNo findings
Why it is in this group
- The description's first verb is "list": a word for reading.
What it can reach
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
Description, as the server wrote it
Lists the official Defra AURN air quality monitoring sites near a UK point, nearest first, with the headline pollutants each currently measures (NO2, ozone, PM2.5, PM10). Every UK-AIR station id is checked against its latest reading and marked current, not_reporting or retired, so you know which id to pass to air_pollutant_history; sites with only retired records are left out. A starting point for "where is air pollution measured near me" for residents, schools, researchers and property buyers. Covers only the national automatic network, not local council diffusion tubes or low-cost sensors. (cost: 1 credit)
Annotations the server declares
- title: air quality stations near
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Exfil surface

Which tools read private data, which read text someone else can write, and which can send data out. One of each is a path a prompt injection can use.

No private-data, untrusted-input, outbound path in this server alone: no tool is tagged private-data or outbound.

Reads private data0: Reads files, mail, messages, databases, secrets, calendars or repositories.
Reads text others write7: Brings in text someone else can write: web pages, inbound email, messages, issues and comments.; air_pollutant_history
air_quality_index_near
air_quality_stations_near
no2_level_near
ozone_level_near
pm10_level_near
pm25_level_near
Can send data out0: Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL.

Other servers in the same agent add their own tools to these paths. Audit your whole setup to see them together.

Remote posture

What anyone on the internet sees at the remote endpoint: an anonymous initialize and tools/list, and the public OAuth metadata.

Tools listed without sign-in

Looked at Nov 14, 2026, 12:21 UTC, unchanged since Nov 7, 2026. No credentials were sent and no tool was called. What is looked at.

Reachable: yes
HTTP status of an anonymous initialize: 200
tools/list served without credentials: yes
Tools that change things, listed without credentials: 6
Protocol version: 2025-06-18
WWW-Authenticate on 401: not observed
resource_metadata in WWW-Authenticate: not observed
RFC 9728 protected resource metadata: not observed
Authorization servers: not observed
Legacy HTTP+SSE transport: no
Dynamic client registration: not observed
Client ID metadata documents: not observed

WarnThe whole server
The endpoint served tools/list without credentials, and the list has 6 tools that change things (6 write). Whether a call also works without credentials was not tested: tools are never called.
Matched text
https://ukdata.reliness.co.uk/mcp/air-quality: tools/list returned 7 tools to an anonymous client, including no2_level_near (write), pm25_level_near (write), pm10_level_near (write), ozone_level_near (write), air_quality_index_near (write) and 1 more
What this check looks for

Findings

Matches of fixed checks, with the text they matched.

No check matched anything in these tool definitions. That is not a safety guarantee.

History

Changes to its tool definitions and to its remote endpoint, newest first.

No change seen yet. Its tools are rescanned every day, and a remote endpoint is looked at once a week.

All changes to this server

Install

Pinned to version 1.5.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http air-quality https://ukdata.reliness.co.uk/mcp/air-quality

claude mcp add --transport http air-quality https://ukdata.reliness.co.uk/mcp/air-quality

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change or a way out, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json

{
  "permissions": {
    "allow": [
      "mcp__air-quality__air_quality_stations_near"
    ],
    "ask": [
      "mcp__air-quality__no2_level_near",
      "mcp__air-quality__pm25_level_near",
      "mcp__air-quality__pm10_level_near",
      "mcp__air-quality__ozone_level_near",
      "mcp__air-quality__air_quality_index_near",
      "mcp__air-quality__air_pollutant_history"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. A read that can send data out (it takes a URL, say) asks first too. It assumes the server is installed as air-quality. Review it before you use it.

Capability tags behind 7 rules

mcp__air-quality__air_quality_stations_near untrusted-input
mcp__air-quality__no2_level_near untrusted-input
mcp__air-quality__pm25_level_near untrusted-input
mcp__air-quality__pm10_level_near untrusted-input
mcp__air-quality__ozone_level_near untrusted-input
mcp__air-quality__air_quality_index_near untrusted-input
mcp__air-quality__air_pollutant_history untrusted-input

Keep the decision: fail CI when the tools change, follow every change, or show a badge.

Pin in CI

Fail a build when the tools you reviewed are not the tools the server serves today.

curl -s "https://anlyon.dev/api/v1/servers/uk.co.reliness/air-quality/verify?hash=ef09f02ecc1940cd0f4a34fbcb89b5af626ff044f69013438564456979b98fa9" | jq -e '.changed == false'

Pinned hash ef09f02ecc19, from Nov 7, 2026, 00:18 UTC.

Watch

Get told when its tools change: a new tool, a new description, a new class.

https://anlyon.dev/servers/uk.co.reliness/air-quality/changes.xml

An Atom feed. Works in any feed reader or Slack's RSS app.

Badge

[![anlyon.dev](https://anlyon.dev/badge/uk.co.reliness/air-quality.svg)](https://anlyon.dev/servers/uk.co.reliness/air-quality)

Source: MCP Registry. Synced Nov 7, 2026, 00:17 UTC.