Agency publications are read on the agency websites.
Beyond four days, these feeds provide period-based weather and haze context. They do not provide daily Singapore PSI or PM2.5 predictions for the next few weeks.
LOOKING AHEAD?
Make tomorrow’s plans with a clearer outlook.
Plan tomorrow’s school run, outdoor plans, and time around the island.
1-hour PM2.5 helps with immediate activities. The 24-hour PSI forecast helps with next-day planning.
A LITTLE PLANNING GOES A LONG WAY
What’s on your agenda?
From a park connector run to the school pick-up. Check the air and weather together.
QUICK START
YOUR PLAN CHECKChecking
Checking this plan
Full official activity guidance
My day
Your plans, with a reminder to recheck.
ON THIS DEVICE
Look back before you look ahead
Your selected region · past 24 hours
OBSERVED, NOT FORECAST
A recent cleaner period does not predict the next one. Recheck current readings before going out.
TWO PLACES. ONE CLEAR COMPARISON.
Which place has the lower reading?
Compare regional conditions before choosing where to spend time.
Readings describe five broad regions. A lower regional value does not guarantee cleaner air at a particular park or street.
A LITTLE HEADS-UPWHILE OPEN
Watch a region
Get an in-app heads-up when PM2.5 reaches your chosen band.
Checks every five minutes while this app is visible. Closing the app stops monitoring; background push alerts are not enabled.
KEEP YOUR HOUSEHOLD IN THE LOOP
A quick air update
Copy a timestamped snapshot to share yourself.
Uses your selected location’s regional readings. No message is sent automatically.
MAKE ONE ROOM YOUR COMFORT ZONE
Is your purifier sized for the room?
Use room volume and smoke CADR to check the sizing target.
EXAMPLE ROOMS
Use smoke CADR at the fan speed you will actually use. This is a sizing estimate, not an indoor air-quality measurement or a guarantee of protection.
NEA sizing method & household guidance
A SMALL BIT OF PREPARATION0 / 5
Your haze-ready home
A practical checklist you can pick up where you left off.
Keep rooms comfortable. When outdoor air improves, revisit ventilation rather than leaving everything sealed indefinitely.
Official household advice
OFFICIAL NEXT-DAY HAZE FORECASTNEA
The next 24 hours
Checking for NEA’s latest published PSI forecast.
Loading official forecast…
Official advisory: haze.gov.sg
THE NEXT FEW DAYS · REGIONAL
What’s on the horizon
Loading the latest regional haze outlook…
This is a regional, qualitative outlook. Numeric multi-day Singapore haze forecasts are not supplied by these feeds.
Regional outlook: haze.gov.sg
Weather for your next four days
Official MSS forecast · islandwide
Loading weather forecast…
Weather gives useful planning context. Rain or wind alone does not predict local haze levels.
ACROSS THE REGION
Latest hotspot & haze situation
Loading official situation update…
Satellite & hotspot reports: asmc.asean.org
TWO NUMBERS. TWO DIFFERENT JOBS.
Check now. Plan ahead.
1-hour PM2.5
Fine particles averaged over one hour. Use this reading and the personal guide to decide about immediate outdoor activities.
For your next walk or run
24-hour PSI
An index covering six pollutants and longer exposure. Use NEA’s published PSI forecast and health advisory when planning the next day.
For tomorrow’s outdoor plans
READING THE SCALE
1-hour PM2.5 bands
Normal0–55 µg/m³
Elevated56–150 µg/m³
High151–250 µg/m³
Very high251+ µg/m³
These are NEA’s Singapore bands. They are not the US AQI or a 1-hour PSI.
Children, older people, pregnant women and people with chronic heart or lung conditions can be more sensitive to haze. Choose “Children & sensitive” on the air quality screen to see the corresponding immediate-activity guidance.
If you feel unwell, reduce exposure and seek medical advice as needed. Your health and symptoms matter alongside the numbers.
Full NEA health advisory HOW THIS APP WORKS
Independent app. Licensed data.
How precise is my location?
NEA publishes readings for North, South, East, West and Central Singapore. Phone location is matched to the nearest official regional reference point. Named places are approximate regional matches, not readings at an individual street.
How often does it update?
The app checks for new data every five minutes while open. The source feeds update about every 15 minutes, with readings representing hourly or rolling 24-hour periods. Each metric shows its own observation time. Delayed and saved readings are labelled.
Is my location stored?
Precise coordinates are used only on your device to select a reporting region. Your selected region, saved places, activity plans, watch settings, room sizing inputs and checklist stay in this browser. We do not send your coordinates to our server.
Privacy and your choices
CheckHaze’s application code uses precise coordinates only on this device to choose a reporting region. Coordinates are not sent to our API or stored by the app. Location is optional and requested only after you tap the location button; revoke permission in your browser settings.
Selected places, plans, health-profile preference, watch settings and room inputs are saved in this browser until you clear them below or clear site data. Avoid sensitive details in shared updates. Notifications are optional and work only while the app is open.
No advertising or analytics trackers are included in our app code. Hosting providers (ChatGPT Sites / Cloudflare) process requests and may retain IP addresses, browser information and operational logs under their own policies. We cannot verify their retention settings from the app. External sites apply their own privacy policies.
For general issues, use the GitHub issue tracker; do not post personal or health information publicly.
Contains information from NEA’s 1-hour PM2.5, PSI, 2-hour Weather Forecast and 4-day Weather Forecast datasets, accessed via data.gov.sg. Reused under the Singapore Open Data Licence v1.0. Observation times appear with the readings; charts and calculations are CheckHaze’s derived analysis.
CheckHaze is not affiliated with or endorsed by NEA, MSS, ASMC or the Singapore Government. Information is provided as available, for general information; it is not medical advice or an emergency warning service.