Singapore Haze & Air Quality Tracker – Live PM2.5 & AQI

Monitor haze, fine-particle pollution and air-quality conditions across Singapore with the Orbis Weather Singapore Haze & Air Quality Tracker.

The dashboard provides a quick view of PM2.5, PM10 and other atmospheric pollutants while helping visitors understand whether regional smoke and haze may be affecting Singapore.

Air quality can change significantly depending on local pollution, rainfall, wind direction and regional fire activity. During transboundary haze episodes, smoke from vegetation and peat fires elsewhere in Southeast Asia can travel hundreds of kilometres and affect air quality across Singapore and neighbouring countries.

The Orbis Weather tracker is designed for situational awareness. For Singapore’s official Pollutant Standards Index (PSI), 1-hour PM2.5 readings and public-health guidance, always follow Singapore’s National Environment Agency.

🌫️ What Causes Haze in Singapore?

Singapore can experience haze when fine particles and smoke accumulate in the atmosphere.

Local pollution sources can contribute to air-quality changes, but some of Singapore’s most significant haze episodes have been associated with smoke transported from fires elsewhere in Southeast Asia.

Vegetation and peat fires can release enormous quantities of smoke containing fine particulate matter.

When regional winds transport that smoke toward Singapore, visibility may decrease and concentrations of PM2.5 can increase.

The severity of any haze episode depends on several factors, including the number and intensity of fires, wind direction, atmospheric stability and rainfall.

🔥 What Is Transboundary Haze?

Transboundary haze is air pollution that crosses national borders.

In Southeast Asia, the term is commonly associated with smoke from large vegetation and peat fires that is carried into neighbouring countries.

Singapore’s air quality can therefore be influenced by events occurring far beyond the country’s borders.

A fire does not have to be close to Singapore to affect the atmosphere over the island. If winds and atmospheric conditions are favorable for long-range smoke transport, pollution can travel considerable distances.

This is why understanding haze requires looking at both Singapore’s air-quality observations and the broader weather and fire situation across Southeast Asia.

🇮🇩 Why Indonesian Fires Matter to Singapore

Indonesia contains large areas of tropical forest and peatland.

During dry conditions, vegetation and peat fires can produce substantial smoke.

Peat fires are particularly important because they can burn beneath the surface and may be difficult to extinguish.

When prevailing winds carry smoke from affected parts of Sumatra or other areas toward Singapore and Peninsular Malaysia, regional air quality can deteriorate.

However, the presence of fires in Indonesia does not automatically mean Singapore will experience haze.

Wind direction and weather conditions determine where smoke travels.

🌧️ How Rain Affects Haze

Rain can temporarily improve air quality by removing some airborne particles from the atmosphere.

Heavy tropical showers and thunderstorms may therefore produce noticeable short-term improvements during polluted periods.

However, rainfall over Singapore does not necessarily stop the regional source of a haze event.

If fires continue burning and winds continue transporting smoke toward Singapore, pollution can return after the rain ends.

Rainfall over fire-affected areas can be more important because persistent rain may help suppress vegetation and peat fires.

💨 Why Wind Direction Matters

Wind is one of the most important factors determining whether regional smoke reaches Singapore.

A large number of fires may be burning somewhere in Southeast Asia while Singapore continues to experience relatively clean air because the smoke is being transported in another direction.

A change in regional winds can alter that situation.

This is why haze monitoring should consider air quality together with weather patterns, regional fire activity and smoke transport.

🧭 The Southwest Monsoon and Haze

Singapore’s Southwest Monsoon generally occurs during the middle portion of the year.

During some periods, regional wind patterns can transport smoke from fires in parts of Indonesia toward Singapore and Malaysia.

Dry weather across fire-prone areas can increase the possibility of vegetation and peat fires.

However, every Southwest Monsoon season is different.

Rainfall patterns, fire activity and wind direction determine whether significant transboundary haze develops.

🌬️ What Is PM2.5?

PM2.5 refers to airborne particles with diameters of approximately 2.5 micrometres or smaller.

These particles are extremely small — much smaller than the width of a human hair.

PM2.5 can originate from vehicle exhaust, industrial activity, combustion and smoke from vegetation or peat fires.

Because these particles are so small, they can penetrate deeply into the respiratory system.

PM2.5 is therefore one of the most important pollutants monitored during significant haze events.

💨 What Is PM10?

PM10 refers to inhalable particles with diameters of approximately 10 micrometres or smaller.

These particles include PM2.5 as well as larger airborne particles.

Dust, construction activity, road particles, smoke and other sources can contribute to PM10 concentrations.

PM10 measurements provide useful information about overall particulate pollution, while PM2.5 is particularly important when monitoring smoke and combustion-related pollution.

📊 What Is Singapore’s PSI?

Singapore uses the Pollutant Standards Index, or PSI, as an official measure for communicating air-quality conditions.

The PSI incorporates several major air pollutants into an index designed to help the public understand overall air quality.

Singapore’s National Environment Agency publishes official PSI information along with other air-quality observations and health guidance.

The Orbis Weather dashboard should not be confused with Singapore’s official PSI reporting system.

🇸🇬 Singapore’s Five Air-Quality Regions

Singapore’s official air-quality reporting divides the country into five regions:

North, South, East, West and Central.

Conditions can vary somewhat across the island because of wind direction, rainfall, traffic and the movement of pollution.

During a widespread regional haze episode, however, elevated particulate pollution may affect much of Singapore.

The five-region reporting system provides residents with a more localized picture than a single national measurement.

📊 U.S. AQI vs Singapore PSI

One particularly important distinction on the Orbis Weather tracker is the difference between U.S. AQI and Singapore PSI.

They are not interchangeable.

The U.S. Air Quality Index uses methodology developed for communicating air quality in the United States.

Singapore’s PSI is calculated according to Singapore’s official methodology.

A numerical U.S. AQI value displayed by a third-party dataset should therefore not be presented as Singapore’s official PSI.

For official Singapore readings and health recommendations, use NEA information.

🟢 What Does Good Air Quality Mean?

When particulate pollution is low, most people can generally participate in normal outdoor activities.

Air-quality conditions can nevertheless vary over time.

A relatively clear morning does not guarantee that conditions will remain unchanged throughout the day, particularly during a regional haze episode.

Monitoring trends can sometimes be more informative than looking at a single reading.

🟡 What Happens When Air Quality Worsens?

As concentrations of fine particles increase, air-quality agencies may recommend changes in outdoor activity, particularly for people more vulnerable to air pollution.

Official health recommendations depend on measured pollution levels and the reporting system being used.

Rather than relying solely on a color displayed by a third-party tracker, Singapore residents should consult current NEA guidance whenever pollution becomes elevated.

😷 Who Can Be More Sensitive to Haze?

Air pollution can affect people differently.

Children, older adults and people with certain heart or respiratory conditions may be more sensitive to elevated particulate pollution.

People who spend extended periods exercising or working outdoors can also inhale larger quantities of polluted air simply because they breathe more heavily during physical activity.

During significant haze episodes, follow official Singapore health recommendations regarding outdoor exposure.

👀 Why Does Haze Reduce Visibility?

The tiny particles contained in smoke scatter and absorb light.

When large concentrations accumulate in the atmosphere, distant buildings and landscapes can appear faded or obscured.

This produces the characteristic gray or brown appearance associated with haze.

Visibility can sometimes provide an obvious visual indication that conditions have changed, but appearance alone is not a reliable measurement of air quality.

Pollution instruments provide much more useful information.

☀️ Can It Be Hazy on a Sunny Day?

Yes.

Haze and clouds are completely different phenomena.

A day can have relatively little cloud cover while still experiencing elevated concentrations of airborne particles.

Sunlight passing through smoke or pollution can sometimes create a muted or reddish appearance, particularly near sunrise or sunset.

Air-quality readings are therefore more useful than simply looking at the sky.

🛰️ How Satellites Track Regional Smoke

Satellites are extremely valuable for monitoring vegetation fires and smoke across Southeast Asia.

Sensors aboard Earth-observing satellites can detect thermal anomalies associated with fires and observe large smoke plumes moving through the atmosphere.

Meteorologists and environmental agencies combine satellite observations with ground measurements and weather forecasts to understand where smoke may travel.

Satellite-detected hotspots are useful indicators of possible fire activity, but not every hotspot represents a major uncontrolled wildfire.

🔥 What Are Fire Hotspots?

A hotspot is an area where satellite instruments detect unusually high thermal energy.

Hotspots can indicate vegetation fires, agricultural burning or other heat sources.

During regional haze episodes, the number and location of hotspots can help authorities understand where significant burning may be occurring.

Hotspot counts should still be interpreted carefully because clouds, satellite coverage and other factors can affect detection.

🌏 Haze Across Southeast Asia

Transboundary haze is not exclusively a Singapore issue.

Smoke can affect parts of Indonesia, Malaysia, Singapore, Brunei and other areas depending on regional atmospheric conditions.

Because the problem crosses national borders, understanding a haze episode requires a regional perspective.

Orbis Weather’s broader Southeast Asia Natural Hazards dashboard can help visitors monitor weather and environmental conditions beyond Singapore.

✈️ Haze and Aviation

Significant haze can reduce visibility and affect aviation operations.

Singapore’s airports are equipped to operate in a wide variety of weather conditions, but severe regional smoke can still affect visibility or disrupt flights elsewhere in Southeast Asia.

Regional fires may also occur near airports or along important air routes.

Travelers should check directly with their airline and airport for operational information during major haze episodes.

🏃 Outdoor Activities During Haze

Running, cycling, outdoor sports and other physical activities increase breathing rates.

During poor air-quality conditions, this can increase exposure to fine particles.

The appropriate response depends on pollution levels, individual health circumstances and official health guidance.

Before strenuous outdoor activity during a significant haze episode, check the latest NEA air-quality information.

🏠 Indoor Air During Haze

Outdoor smoke can enter buildings through open doors, windows and ventilation.

During significant haze events, indoor air quality can therefore also be affected.

Official Singapore authorities may provide recommendations for reducing exposure when pollution becomes elevated.

People should follow current government health guidance rather than relying on generic advice when conditions become serious.

📍 Is Singapore Hazy Right Now?

The Orbis Weather Singapore Haze & Air Quality Tracker provides a quick way to examine current particulate-pollution information.

Check PM2.5 and PM10 levels and compare changing conditions over time.

For confirmation of Singapore’s official PSI and 1-hour PM2.5 readings, use information published by Singapore’s National Environment Agency.

During a developing regional haze episode, also monitor weather patterns, wind direction and official haze advisories.

🔎 Where Does Orbis Weather Get Air-Quality Data?

The current browser-based Orbis Weather Singapore tracker uses Open-Meteo air-quality data to provide live values.

Singapore’s official PSI and 1-hour PM2.5 observations are published by the National Environment Agency.

The tracker also directs visitors to Singapore’s official haze information and the Meteorological Service Singapore for additional environmental and weather information. (Orbis Weather)

Orbis Weather organizes these resources for situational awareness but does not independently measure air pollution or issue Singapore air-quality warnings.

🇸🇬 Monitor Singapore Haze & Air Quality

Singapore’s air quality can change as local pollution, rainfall, wind and regional smoke conditions evolve.

During significant Southeast Asian fire seasons, monitoring PM2.5 alongside wind direction and regional hotspot activity can provide valuable context.

Use the Orbis Weather Singapore Haze & Air Quality Tracker for a quick overview, then consult official Singapore sources when air-quality conditions become elevated.

For broader regional monitoring, explore Singapore Weather & Natural Hazards, Singapore Monsoon & Flood Tracker, Southeast Asia Natural Hazards and the Daily Southeast Asia Weather & Natural Hazards Briefing.

Important Air-Quality Disclaimer

The Orbis Weather Singapore Haze & Air Quality Tracker is provided for general information, education and situational awareness.

Live values displayed by the current browser-based tracker come from third-party air-quality data and are not Singapore’s official PSI readings. Singapore’s official PSI, 1-hour PM2.5 information, haze advisories and public-health recommendations are issued by the National Environment Agency. (Orbis Weather)

Air-quality information can change rapidly and individual monitoring systems can differ in methodology and update frequency.

Do not use the Orbis Weather tracker as a substitute for official health or emergency guidance.