A doctor once told me that particulate matter (PM) measurement in Ukraine at the February 2022 start of the war with Russia was an average 24.2 µg/m3 (micrograms per cubic meter). This November ...

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 index ranges from 0 to 500 and uses a color coded system: As of Monday evening, the AQI was between 30 and 60 throughout L.A. County — in the “good” or “moderate” range — according ...

AQI uses 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 elevated for everyone.