Each of the health risk categories has advice associated with it. At t... - dofaq.co
air quality index

Each of the health risk categories has advice associated with it. At t...

 wikipedia - 19 Sep 2020
Each of the health risk categories has advice associated with it. At the low and moderate levels the public are advised that they can continue normal activities. For the high category, children, the elderly and people with heart or respiratory illnesses are advised to reduce outdoor physical exertion. Above this (very high or serious), the general public are likewise advised to reduce or avoid outdoor physical exertion.

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