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What Are the PM 2.5 Levels, and How Dangerous Are They?

• 0-25: Excellent air quality. Activities can proceed as normal.
• 26-37: Good air quality. At-risk groups should start taking precautions.
• 38-50: Moderate air quality. The general public and at-risk groups should begin to exercise caution and avoid outdoor activities.
• 51-90: Poor air quality. The general public and at-risk groups should avoid outdoor activities and wear PM 2.5 protective masks.
• 91 and above: Hazardous air quality. The general public and at-risk groups should refrain from outdoor activities and wear PM 2.5 protective masks.

More details: https://url.in.th/GeYvY

Source: Department of Disease Control