AirNow.gov
AirNow is your one-stop source for air quality data. Our recently redesigned site highlights air quality in your local area first, while still providing air quality information at state, national, and world views.
World's Air Pollution: Real-time Air Quality Index
Air Quality Index (AQI) Calculation. The Air Quality Index is based on measurement of particulate matter (PM 2.5 and PM 10), Ozone (O 3), Nitrogen Dioxide (NO 2), Sulfur Dioxide (SO 2) and Carbon Monoxide (CO) emissions.
Air Quality Index (AQI) | AirNow.gov
Local air quality can affect our daily lives. Like the weather, it can change from day to day. EPA developed the Air Quality Index, or AQI, to make information available about the health effects of the five most common air pollutants, and how to avoid those effects.
What is the Air Quality Index? Here's How to Stay Safe
Jun 5, 2024 · What is the Air Quality Index? The Air Quality Index measures the density of five pollutants in the air: ground-level ozone, particulates, carbon monoxide, nitrogen dioxide, and...
Air quality: Canadian wildfire smoke blankets the U.S. - NBC News
Jun 8, 2023 · The air quality index, or AQI, in New York exceeded 340 Wednesday afternoon — making it the city with worst air quality in the world — as smoke from wildfires in eastern Canada wafted into the...
June 7, 2023 Canada wildfire smoke and US air quality news
Jun 7, 2023 · More than 75 million people across the Northeast, Midwest and mid-Atlantic in the US are under air quality alerts as wildfire smoke originating from Canada shrouds major US cities.
What Happens When the Air Quality Index Surpasses 500?
Jun 9, 2023 · New York City’s smoke-clogged air reached 407 on the Environmental Protection Agency’s 500-point Air Quality Index at one point this week, signifying that pollution levels were “hazardous” and at...
New WHO Global Air Quality Guidelines aim to save ...
Sep 22, 2021 · New WHO Global Air Quality Guidelines (AQGs) provide clear evidence of the damage air pollution inflicts on human health, at even lower concentrations than previously understood. The guidelines recommend new air quality levels to protect the health of populations, by reducing levels of key air pollutants, some of which also contribute to ...
Air Quality Index (AQI) Basics - AirNow
The U.S. Air Quality Index (AQI) is EPA's tool for communicating about outdoor air quality and health. The AQI includes six color-coded categories, each corresponding to a range of index values. The higher the AQI value, the greater the level of …
Air Quality | US EPA - U.S. Environmental Protection Agency
Oct 28, 2024 · The U.S. Air Quality Index is EPA's index for reporting air quality. Every day the AQI tells you how clean or polluted your outdoor air is, along with associated health effects that may be of concern.