The Air Quality Index (AQI) — which measures the concentration of pollutants in the air — seemed to confirm all was well in the L.A. atmosphere, with low numbers that suggested clean, healthy air.

As the AQI chart numbers gets higher, there are more warnings about ventilation and more restrictions on outdoor activities. Good : It’s fine to do normal activities and keep the windows open.

AQI charts — which look at the amount of PM2.5 and other pollutants like ozone in the air — are typically displayed in different tiers: 0 to 50 – The air is good.

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 ...

Plumes of smoke from Southern California’s fires blew across Big Bear on Sept. 11, causing local air quality meters to return off-the-chart readings for particulate pollution. Officials report ...

As the chart shows, for PM2.5 concentrations up to 60 microgram per cubic metre (µg/m3), AQI increases by 1.67 for every 1µg/m3 increase in PM2.5 concentration.

Whereas Karachi's AQI was seen hovering around the 200-mark — which is termed "very unhealthy" by the monitor. Meanwhile, concentration of PM2.5 pollutants in the air stood at 45.3 and 24.2 ...

The Air Quality Index chart is divided into six different colors. (Centers for Disease Control and Prevention) (Photo: Centers for Disease Control and Prevention) ...

The Air Quality Index (AQI) can tell you a lot about the health of the environment, but there are still measures you can take to protect yourself further. Skip to main content. Animals ...

After fires destroyed multiple neighborhoods across Los Angeles County, many residents looked up to find blue, smoke-free skies this week. The Air Quality Index (AQI) — which measures the ...