T he air quality in Delhi-NCR is in the ‘severe plus’ category with the Air Quality Index (AQI) in most stations touching the 500-mark today, November 19. This is the seventh day that NCR has ...

The scale has six color-coded levels of concern and runs from 0 to 500 AQI value. Each code has a definitive "values of index" range and corresponds to different levels of health concerns.

The toxic air in the United States this week has flirted with the upper range of the 500-point scale. In the past decade, there have been times when the air quality was even worse.

The EPA's air-quality index (AQI) measures how safe, unhealthy, ... The scale spans from numbers 0 to 500. A higher AQI value signifies a higher level of air pollution and a greater health risk.

The Air Quality Index displayed on AirNow.gov shows ... Weather Service says that the Environmental Protection Agency calculates the Air Quality Index — a value between 0 and 500 — based on ...

A thick layer of smog engulfed the National Capital on Sunday, and the Air Quality Index (AQI) continued to deteriorate, crossing the 500 mark, two days after Diwali. The government may soon ...

The AQI measures air quality on a scale from 0 to 500, with readings below 50 considered "Good" and above 300 classified as "Hazardous," signaling emergency conditions where health risks are ...

As per official statistics, 20 monitoring stations throughout the city detected AQI levels hitting the highest 500 mark by Monday evening. Furthermore, due to the GRAP Stage 4 restrictions ...

The national average air quality index in 2023 was 38, according to IQAir, a Swiss air quality technology company. More than 100 nations had cleaner air , on average, than the United States, and ...

On Monday, air quality levels in New Delhi skyrocketed, with 15 monitoring stations maxing out at an AQI of 500. The situation deteriorated significantly with PM2.5 concentrations hitting alarming ...

To measure this, the U.S. Environmental Protection Agency calculates a daily air quality index, known as the AQI, on a scale of zero to 500. The AQI measures anything from zero to 50 as healthy ...

The EPA's Air Quality Index can tell you whether breathing outside air can hurt you. How to read the scale. ... "Think of the AQI as a yardstick that runs from 0 to 500.