For those planning immediate outdoor activities, NEA advises checking the hourly PM2.5 levels.
The 24-hour PSI forecast and corresponding health advisories should be used in planning next day outdoor activities.
When 1-hour PM2.5 levels are elevated, healthy people are advised to reduce strenuous outdoor activity for the next hour, while the elderly, pregnant women, children and people with chronic heart or lung conditions should avoid such activity.
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