Each Air Quality Index category, also known as the level of concern, is attached to a certain range of values: Good (green): 0 to 50 Moderate (yellow): 51 to 100 ...

As smoke from Canadian wildfires has made its way into the U.S., it is important to understand how the air quality index works. Here's what each color code means.

An AQI value of 100 is considered the threshold for safe air quality. Values at or below 50 are considered good, with 51 to 100 considered “moderate,” or potentially risky for people who are ...

Unhealthy Air Quality Index level. Red: Indexes in the 151 to 200 range are considered "unhealthy." At this level, any member of the general public becomes susceptible to health effects.

AirNow and PurpleAir use the Air Quality Index, or A.Q.I., a measure of air quality from 0 to 500 that is composed of six categories, from “good” to “hazardous.” ...

More: Air Quality Index (AQI) Basics What do the numbers mean? An AQI level of 50 or below represents good air quality, while an AQI value of more than 300 represents hazardous air quality.

Good Air Quality Index level. Green: Indexes in the 0 to 50 range are "good." Air quality is satisfactory, and air pollution poses little or no risk. Moderate Air Quality Index level.

With wildfire smoke in the forecast, track the drop in air quality across dozens of PurpleAir sensors with our live, updating ...

If you live in the Midwestern, Northeastern or Middle Atlantic U.S. and breathe air, there’s a good chance that you’ve heard about the Air Quality Index (AQI) at some point over the past month.

The Air Quality Index does not take into account many gas or particle contaminants that are produced during wildfires, particularly when houses, cars and other man-made materials go up in flames.

Delhi experienced its cleanest air since September 2023, with the AQI reaching the 'good' category due to rain and favorable ...

Air quality in the Chicago area remains poor for the third straight day in a row, with an air quality alert in effect through Wednesday night, along with extremely muggy conditions and the chance for ...