Thousands of residents across parts of California and Oregon have been advised to stay indoors where possible on Thursday due to concerns over high levels of air pollution.

The Environmental Protection Agency ( EPA )’s AirNow map shows that areas including Cromberg, Portola, and Sattley in California, and La Pine in Oregon face "unhealthy" levels of air quality as on 03.10 a.m. ET on Thursday.

Why It Matters

Unhealthy levels of air pollution in the atmosphere can affect everyone, but vulnerable people, especially the elderly, children, and those with existing heart or lung conditions, can be particularly affected.

Exposure to poor air can lead to eye, throat, and nose irritation, coughing, chest tightness, or shortness of breath.

When pollution is in the "unhealthy" range, the E

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