Air Quality Index

Check the live air quality index (AQI) for any city or your current location — PM2.5, PM10, ozone and more, with plain-English health guidance. Free, powered by Open-Meteo.

Air quality for your location
100% free, no sign-up No tracking, no ads Data by Open-Meteo / CAMS

How It Works

Pick a place and read the air — no account, no key.

1

Choose a location

Search for a city and select it, or tap "Use my location" and allow access. The coordinates are sent to Open-Meteo to fetch the current air quality for that exact spot.

2

Read the AQI

The big number is the US EPA Air Quality Index, colour-coded from Good to Hazardous, with a short line on what it means for health. The European AQI is shown too for anyone in Europe. Sensitive to sun as well? Check the UV Index tool.

3

See what's driving it

The pollutant grid lists PM2.5, PM10, ozone, NO₂, SO₂ and CO so you can tell whether fine particles or a gas is behind the number. Chasing allergens instead of pollution? Open the pollen forecast, or plan your week with the weather forecast.

Frequently Asked Questions

What is the AQI and what counts as good air quality?
AQI stands for Air Quality Index — a single 0-to-500+ number that summarises how polluted the air is and what it means for health. On the US EPA scale, 0–50 is Good, 51–100 Moderate, 101–150 Unhealthy for Sensitive Groups, 151–200 Unhealthy, 201–300 Very Unhealthy, and 301+ Hazardous. This tool shows the current AQI plus the individual pollutants behind it, so you can see whether fine particles (PM2.5), ozone or another gas is driving the number.
Where does the air quality data come from?
The readings come from Open-Meteo's free Air Quality API, which is built on the Copernicus Atmosphere Monitoring Service (CAMS) global and European models. When you choose a location, your browser requests the current AQI and pollutant levels directly from Open-Meteo and displays them. LK Forge does not run its own monitoring stations.
Is it free and do I need an API key?
Yes — the air quality tool is completely free, and no API key or sign-up is required. Open-Meteo offers free access for non-commercial use, so the tool works straight away with nothing to configure. There is no account, no paid tier and no advertising anywhere on the page.
What do PM2.5 and PM10 mean?
PM2.5 and PM10 are fine particulate matter — tiny airborne particles measured in micrograms per cubic metre (µg/m³). PM2.5 particles are 2.5 micrometres or smaller and can reach deep into the lungs and bloodstream, so they are the most health-relevant pollutant and usually drive the AQI. PM10 includes larger particles such as dust and pollen fragments. The tool lists both alongside ozone, nitrogen dioxide, sulphur dioxide and carbon monoxide.
Does this tool show US or European AQI?
It shows the US EPA AQI as the headline number, because that is the scale most people search for, and also lists the European AQI (EAQI) underneath for anyone in Europe. The two scales use different breakpoints, so the same air can read as a different number on each — comparing them side by side makes the difference clear.
Does this tool use my location?
To return a reading it needs a place, so it sends a location to Open-Meteo — either coordinates from your browser's geolocation (only if you tap "Use my location" and grant permission) or the coordinates of the city you search for. LK Forge itself does not track you and shows no ads.