Air Quality Index Explained

Cyclosporiasis , Air Quality

With smoke from Canadian wildfires triggering air quality alerts across the Midwest and Northeast, more than 125 million people are becoming intimately familiar with the Air Quality Index, or AQI, a c...

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July 16: Cyclosporiasis , Air Quality

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Detroit's air quality among worst in world

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Conditions may improve Friday, but poor air quality may persist this weekend: Environment Canada

Hazy conditions persisted in Toronto and much of southern Ontario on Thursday as wildfire smoke from the north drifted south for the second consecutive day.

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Wildfire smoke blankets Toronto, turning skies orange and prompting air quality warning

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Toronto the orange: Wildfire smoke leaves city under dirty sky with no relief likely until Friday

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Recap: Ontario wildfires choke Toronto with poor air quality, orange haze; smoke forecast map predicts conditions to come

On Wednesday evening, the city had the fifth-worst air quality on the planet with an index of 155, according to IQAir.

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Smoke from Canadian wildfires triggers air quality alerts across 18 states in the Great Lakes and Northeast regions — follow live updates

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Wildfire smoke blankets Hamilton and Niagara Wednesday, prompting air quality warning and cancellations

The Weather Network on MSN

AQI, AQHI, and your health: Air quality ratings explained

Learn the difference between AQI and AQHI and the health impacts of poor air quality.

WKYC3

How safe is the air? Here's how to check and what the numbers mean

The index rates how clean or polluted the air is each day. The EPA uses this measure to keep tabs on five kinds of air pollutants. The main concern from the wildfire smoke is fine particle pollution, or PM2.5. These particles are tiny enough to get deep ...

2hon MSN

What is Code Red and Code Purple air quality?

What are "Code Red" and "Code Purple" air quality alerts? The Air Quality Index has six color-coded categories, ranging from cleanest to hazardous.

Yahoo

Air Quality Index explained

Add Yahoo as a preferred source to see more of our stories on Google. A doctor at National Jewish Health explains what different Air Quality Index (AQI) readings mean for you.