Hazy skies are the result of wildfire smoke from the Northwestern United States and Canada.

The jet stream is carrying smoke from Canada across much of the lower 48.

Some areas are seeing such high amount of smoke and other tiny particles that people with respiratory health conditions such as asthma are warned to stay indoors.

In Nashville, smoke levels on July 21 triggered a Code Orange air quality alert.

A Code Orange is effected when particulate matter concentrations within the region may approach or exceed unhealthy standards.

Oftentimes, the general public is not affected by passing smoke. However, individuals with lung disease and asthma, as well as some active adults and children, should remain cautious.

As of July 5, emergency crews are battling more than 180 wildfires in British Columbia. This string of fires is due in part to a massive heat wave impacting the area.

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