Search results
Results from the WOW.Com Content Network
Since 1999, the EPA has used the air quality index (AQI) to communicate air pollution risk to the public, on a scale from 0 to 500, with six levels from Good to Hazardous. [10] (The previous version was the Pollutant Standards Index (PSI), which did not incorporate PM2.5 and ozone standards.)
800-290-4726 more ways to reach us. Sign in. Mail. 24/7 Help. ... Which counties have the worst AQI? Karlee Van De Venter, Shaun Goodwin. August 21, 2023 at 2:20 PM ... What is the Air Quality Index?
This list contains the top 500 cities by PM2.5 annual mean concentration measurement as documented by the World Health Organization covering the period from 2010 to 2022. The January 2024 version of the WHO database contains results of ambient (outdoor) air pollution monitoring from almost 5,390 towns and cities in 63 countries.
The AQI uses a scale that typically ranges from zero to 500 to denote air quality. If your area has an AQI of 50 or below, you're in a green zone. If your area has an AQI of 50 or below, you're in ...
An individual score (Individual Air Quality Index, IAQI) is calculated using breakpoint concentrations below, and using same piecewise linear function to calculate intermediate values as the US AQI scale. and The final AQI value can be calculated either per hour or per 24 hours and is the max of these six scores.
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 ...
All data are valid for the year 2022 and are taken from the Air Quality Life Index (AQLI) of the University of Chicago. ... United States: 6.91 −0.19 161
Hazardous air quality levels are indexed at 300 or higher. As the day progressed, levels dropped from 325 to 182, improving the quality of the air to "unhealthy" rather than hazardous.