What is the UV Index?

The UV Index (UVI) measures the intensity of ultraviolet radiation from the sun at a given time and place. It runs on a scale from 0 to 11+, where higher numbers indicate stronger UV radiation and greater risk to skin and eyes.

A UVI of 0–2 is considered Low — minimal protection needed for most people. At 3–5 (Moderate), sun protection is recommended during extended outdoor time. A UVI of 6–7 (High) means protection is essential, and midday shade is advisable. At 8–10 (Very High), unprotected skin can burn in as little as 15–25 minutes. At 11+ (Extreme), all precautions are critical.

UV intensity varies by time of day (peaks at solar noon), season, altitude, cloud cover, and latitude. Even on overcast days, UV can be significant — clouds block visible light more effectively than UV radiation.

What is the Air Quality Index?

The Air Quality Index (AQI) is a standardized scale developed by the US EPA that communicates how polluted the air is and what health effects you might experience. It runs from 0 to 500, divided into six categories.

0–50 is Good — air quality is satisfactory. 51–100 is Moderate — acceptable for most, but sensitive individuals may notice effects. 101–150 is Unhealthy for Sensitive Groups. 151–200 is Unhealthy — everyone may experience effects. 201–300 is Very Unhealthy, and 301+ is Hazardous — health warnings for the entire population.

Key pollutants contributing to AQI include fine particles (PM2.5, PM10), ground-level ozone (O₃), nitrogen dioxide (NO₂), sulfur dioxide (SO₂), and carbon monoxide (CO). Children, elderly, and people with respiratory or cardiovascular conditions are most vulnerable to elevated AQI levels.

About UVAQI

UVAQI provides real-time UV index and air quality data for cities worldwide, helping you make informed decisions about outdoor activities. Whether you're planning a morning run, a day at the beach, or just deciding whether to open your windows, UVAQI gives you the data you need at a glance.

The site shows hourly UV forecasts, a full breakdown of pollutants (PM2.5, PM10, ozone, NO₂, SO₂, CO), and personalized health recommendations based on current conditions. UV data is sourced from NOAA via currentuvindex.com, and air quality data is from the Copernicus Atmosphere Monitoring Service via Open-Meteo. No API keys or signup required — all data is free and updated in real time.