Air quality (global)

Current air quality index and pollutant concentrations for any location: US AQI, PM2.5, PM10, ozone, NO2, SO2, CO. Send GET /api/weather-air-quality with the required fields lat and lon and pay $0.002 per call over x402 or MPP (there is no free tier). It returns a JSON object with lat, lon, airQuality and source.

Open-Meteo air quality API, no key, global. ?lat=28.61&lon=77.23.

Category: Live public data · Tags: weather air-quality aqi pollution pm25 global open-meteo

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Parameters

Example request

curl -i "https://agent402.tools/api/weather-air-quality?lat=28.6139&lon=77.209"

Without payment this returns HTTP 402 Payment Required with the exact price for weather-air-quality; any x402 v2 or MPP client pays it and retries.

Example response

{
  "lat": 28.6139,
  "lon": 77.209,
  "airQuality": {
    "time": "2026-06-23T14:00",
    "usAqi": 142,
    "category": "Unhealthy for Sensitive Groups",
    "pm25": 52.3,
    "pm10": 88.1,
    "ozone": 45.2,
    "nitrogenDioxide": 28.7,
    "sulphurDioxide": 12.4,
    "carbonMonoxide": 420,
    "units": {
      "pm": "μg/m³",
      "gases": "μg/m³"
    }
  },
  "source": "air-quality-api.open-meteo.com (CC BY 4.0)"
}

From an MCP client

catalog.call {
  "slug": "weather-air-quality",
  "params": {
    "lat": 28.6139,
    "lon": 77.209
  }
}

The hosted connector at https://agent402.tools/mcp needs a payment for weather-air-quality; the stdio package pays it from a wallet or from AGENT402_CREDITS_KEY. Local install: npx -y agent402-mcp.

Errors and behavior

• lat and lon are required. An input the tool rejects returns an HTTP 4xx whose body carries error, tool, expected, required and example, so the caller can correct it.
• A paid call that ends in any status of 400 or above is not charged over x402, MPP or a prepaid credits key: settlement is cancelled when the tool fails. The exception is a Tempo push credential, a transfer the buyer sent before the call: it settles before the tool runs, so if the tool then fails the payment is recorded as a refund owed to the paying wallet.
• Wallet-only: this tool reaches the network or stored state, so it has no proof-of-work tier. A prepaid card-credits key issued earlier (Authorization: Bearer a402_...) also pays it.
• A POST with a JSON body to /api/weather-air-quality is served as this GET, with the body as the input.
• An Idempotency-Key header makes a retried paid call replay the first 200 instead of charging again (an answer larger than 1 MB is not replayed).

Paid call (JavaScript agent)

import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client();
client.setSpendControls?.(false); // keep your own spending ceiling in code
registerExactEvmScheme(client, { signer: privateKeyToAccount(KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agent402.tools/api/weather-air-quality?lat=28.6139&lon=77.209");

Part of these workflows

Air quality (global) is one step in this skill pack, each sold as a single call:

• Weather briefing - Full weather briefing for a location: current conditions, 7-day forecast, and air quality index in one pass.

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