Discover the S&P/ASX 200 Index, Australia's key stock benchmark. Learn about its structure, significance, and why it matters ...

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PHILADELPHIA (WPVI) -- With smoke blowing into the Philadelphia region from the wildfires in Canada, you may have heard a lot about the Air Quality Index or AQI. But what it is, exactly? The Air ...

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, ...

The 184 rating was consistent with ratings the city’s air earned this past weekend, as well as a National Weather Service air quality alert in place for Eastern Washington through noon Thursday, at ...

The 184 rating was consistent with ratings the city’s air earned this past weekend, as well as a National Weather Service air quality alert in place for Eastern Washington through noon Thursday, at ...