Around the island

Showing 1-hr PM2.5 in µg/m³. Tap a region to see it above.

Central

NEA advice for the next hour

Avoid

strenuous outdoor activity for the next hour.

Vulnerable persons: Avoid all outdoor activity for the next hour.That's the elderly, pregnant women, children, and persons with chronic lung disease or heart disease.

Based on the 1-hr PM2.5 band (High).

NEA advice for the day

PSI 178Unhealthy

Healthy persons: Reduce prolonged or strenuous outdoor physical exertion
Elderly, pregnant women, children: Minimise prolonged or strenuous outdoor physical exertion
Persons with chronic lung disease, heart disease: Avoid prolonged or strenuous outdoor physical exertion

Based on the 24-hr PSI band.

At home

Close the windows, especially in bedrooms.
Run an air purifier with a HEPA filter in the room you use most, with its door closed.
Using aircon? Set it to recirculate, not fresh air.
Avoid incense, joss sticks, candles, smoking and heavy frying. They add to the PM2.5 indoors.
If someone at home is vulnerable, keep one room as a clean room with a purifier.

Going out

Sheltered isn't indoors. Void decks, covered walkways and open-air hawker centres have the same air as outside.
Check the 1-hr PM2.5 before exercising outdoors. It changes from hour to hour.
Outdoors for long? An N95 mask filters PM2.5; surgical masks don't. N95s aren't designed for young children.
Choose air-conditioned places for exercise and errands.

Signs to watch for

Throat or eye irritation from short exposure usually clears once you're out of the haze. Anyone feeling unwell should see a doctor, especially with breathlessness, chest tightness or wheezing. If you have asthma or a heart condition, keep your medication within reach.

PSI Haze alerts

Get a notification on this device when the haze gets serious. No app or sign-up needed.

When 1-hr PM2.5 turns High or Very highRight-now air in any region; and when it easesWhen 24-hr PSI goes above 200Once when it crosses, once when it drops backEvery hour: latest readingsHighest 1-hr PM2.5 and NEA's adviceMorning summary at 7amCentral's PSI and NEA's advice

How the readings are graded

1-hr PM2.5 (µg/m³)

Normal0–55
Elevated56–150
High151–250
Very high251+

24-hr PSI

Good0–50
Moderate51–100
Unhealthy101–200
Very unhealthy201–300
Hazardous301+