India, April 24 -- Various popular weather apps across Chicago sparked panic among residents by showing that the air was unsafe to breathe early Wednesday morning, April 23. Google's air quality map showed that Chicago had the worst air in the country. According to Apple's weather app, too, the Air Quality Index had climbed into the 400s. The reading was so hazardous that people felt the need to stay indoors.

All of this happened only for it to later be revealed that the reading was actually a glitch.

Madeline Blair, 24, woke up to find her Apple weather app showing such unhealthy air quality levels, and decided to skip her morning walk. Instead, she went down into her basement to retrieve her air filter.

"I live on the northwest side,...