Air quality index of major cities in North America February 18: Miami 'good'

Below is information on the current background air quality in some of North America's major cities based on data taken from recorded at 3:05 pm GMT February 18. 

City Quality
Atlanta (Georgia)  [Moderate]
Chicago (Illinois)  [Good]
Dallas (Texas) [Good]
Denver (Colorado) [Good]
New Orleans (Louisiana)  [Good]
New York City (New York) [Good]
Miami (Florida) [Good]
San Francisco (California) [Good]
Washington DC (District of Columbia) [Good]
Montreal (Quebec)   [Good]
Toronto (Ontario) [Good]
Vancouver (British Columbia)  [Good]


Air Quality
Unhealthy for sensitive groups [UHSG]
Very unhealthy 
N/A  N/A


The above data was collected from, an interactive website developed by the US EPA, NOAA, NPS, tribal, state and local agencies to provide public information on national air quality.

The data used is collected using either federal reference or equivalent monitoring techniques or techniques approved by the state, local or tribal monitoring agencies and is displayed on a hourly basis and as such is not fully verified and is therefore only for the purposes of reporting the Air Quality Index.

The indices have six levels from ‘Good' through to ‘Hazardous' based upon five major pollutants regulated by the Clean Air Act -- ground-level ozone, particulate pollution, carbon monoxide, sulfur dioxide and nitrogen dioxide and the potential health risk posed by these pollutants.

For more information on the index calculation and the health risks posed by pollutants see:

  • COMMENT: Xenophobia rears its ugly head in Singapore once more 18 hours ago
    COMMENT: Xenophobia rears its ugly head in Singapore once more

    Kirsten Han is a Singaporean blogger, journalist and filmmaker. She is also involved in the We Believe in Second Chances campaign for the abolishment of the death penalty. A social media junkie, she tweets at @kixes. The views expressed are … Continue reading →

  • Driving a $900,000 Porsche 918 Spyder to the future 21 hours ago
    Driving a $900,000 Porsche 918 Spyder to the future

    It’s more than just its inherent speed, or the whooshing noise that fills the cabin like a school choir jamming with James Hetfield. It’s what it represents in an industry full of skeptics. It’s a portal into the future – a time capsule left by some mad scientist born decades too soon. It’s something that shouldn’t exist. And yet it does.

  • 919 reasons to love: Flickr photo of the day 22 hours ago
    919 reasons to love: Flickr photo of the day

    We've brought you the drive video of the $900,000 Porsche 918 Spyder -- an 887-hp hybrid supercar with two electric motors working in harmony with a big 4.6-liter V-8. But how about this? Porsche's hybrid Le Mans racer -- the 919 Hybrid, sent to us by Kevin Leech. Get on board with electrification, folks. Because it's taking over the world.