An enigmatic air quality crisis has erupted.
Chicago
, as the city was apparently covered in toxic chemicals on Wednesday.
Air quality maps show a massive plume of dangerous air covering the whole Chicago metropolitan region, with measurements hitting 500 on the Air Quality Index (AQI), which represents the absolute highest level on the scale.
Google
Maps.
A value of 500 on the Air Quality Index signifies dangerously polluted air, indicating pollution levels that exceed the highest thresholds usually recorded by measuring equipment.
These occurrences are usually observed during intense phenomena such as huge forest fires or volcanic activities.
This story is evolving, with more updates to come shortly.
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