ForHosting KIT · Developer Utilities

Classify an Air Quality Index Category and Health Guidance

The AQI category classifier turns a numeric U.S. Air Quality Index value into a clear EPA category and a short explanation of what that level generally means for health.

● BetaFree · in your browser

Run — free How it works & API

Use it from WebAPIEmailTelegramApp soon

Enter an AQI reading to distinguish good, moderate, unhealthy for sensitive groups, unhealthy, very unhealthy, and hazardous conditions. The result is deterministic and easy to use in dashboards, alerts, reports, and automated decisions. It does not fetch a current reading or replace local public-health advice; it classifies the value you provide.

How to use it

Enter your values in the form above. The tool checks them before calculating and shows the result on the same page.

Check your inputs

Use the labels and units shown next to each field. If something is missing or outside the allowed range, the page points to the field to fix.

Use it again or automate it

Use the browser tool for individual checks and the API when you need the same capability in an automated workflow.

What you can do with it

Get an answer now

Enter one set of values and see the result without building a spreadsheet or script.

Compare scenarios

Change one value at a time and rerun the calculation to understand what affects the result.

Automate repeated work

Use the API when the same calculation needs to run inside your product or workflow.

FAQ

Which AQI standard does this use?

It uses the six category boundaries of the U.S. EPA Air Quality Index: good through hazardous.

What happens at an exact boundary?

The published inclusive ranges are applied directly. For example, 100 is moderate, while 101 is unhealthy for sensitive groups.

Can I enter a decimal AQI value?

Yes. Any finite nonnegative number is accepted and compared directly without rounding.

Does it retrieve current air quality for my location?

No. It only classifies the AQI value you provide and makes no network request.

Is the guidance medical advice?

No. It is general health guidance for communicating AQI conditions. Follow official local alerts and professional medical advice when relevant.

What does it cost?

It runs free in your browser on this page, and API requests cost $0.002 each.

For developers — API access

Everything on this page is available programmatically. This section is for teams who want to wire it into their own systems; everyone else can just use the tool above.

API endpoint

POSThttps://api.kit.forhosting.com/weather/air-quality-index-category

Prefer to automate it? One authenticated POST creates the task; the result comes back by webhook or a signed link. The same capability also runs here on the web, by email and from Telegram — and soon from our app too.

Call it from your stack

curl -X POST https://api.kit.forhosting.com/weather/air-quality-index-category \
  -H "Authorization: Bearer $KIT_KEY" \
  -H "Content-Type: application/json" \
  -d '{"aqi":42}'

const res = await fetch("https://api.kit.forhosting.com/weather/air-quality-index-category", {
  method: "POST",
  headers: {
    "Authorization": `Bearer ${process.env.KIT_KEY}`,
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
    "aqi": 42
  })
});
const { task_id } = await res.json();

import os, requests

res = requests.post(
    "https://api.kit.forhosting.com/weather/air-quality-index-category",
    headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
    json={
    "aqi": 42
},
)
task_id = res.json()["task_id"]

<?php
$res = file_get_contents("https://api.kit.forhosting.com/weather/air-quality-index-category", false, stream_context_create([
  "http" => [
    "method"  => "POST",
    "header"  => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
    "content" => '{"aqi":42}',
  ],
]));
$task = json_decode($res, true);

body := bytes.NewBufferString(`{"aqi":42}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/weather/air-quality-index-category", body)
req.Header.Set("Authorization", "Bearer "+os.Getenv("KIT_KEY"))
req.Header.Set("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)

Example request

{
  "aqi": 42
}

Example response

{
  "task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
  "type": "weather.air_quality_index_category",
  "status": "queued",
  "_links": {
    "result": "/tasks/tsk_…/result"
  }
}

The API is asynchronous: the call returns a task_id immediately and the result arrives by webhook. Polling is capped at 1 req/s per task.

Pricing

Per request$0.002

Published price — no tokens, no invented credits. A failed task is never charged.

Errors

HTTP	Code	Meaning
`401`	`unauthorized`	Missing or invalid API key.
`402`	`insufficient_balance`	Your balance doesn't cover the task price.
`404`	`unknown_type`	That task type doesn't exist.
`429`	`rate_limited`	Too many requests. Use the webhook instead of polling.

Read the full KIT documentation →