How wildfire smoke from Indonesia can affect your health

PART C

How wildfire smoke from Indonesia can affect your health: key facts at a glance.

⚡ Quick Answer

Wildfires in Indonesia are burning an area three times the size of Singapore, according to Nasa. The resulting toxic haze can travel vast distances. While direct smoke reaching the UK is unlikely, the event serves as a reminder of how global air quality shifts can affect respiratory health, with particles potentially worsening conditions like asthma.

Indonesia is currently in the grip of a climate emergency. Nasa has described the wildfires there as the 'apex predator' of such events, burning through an area three times the size of Singapore. Millions across south-east Asia are being choked by the toxic haze it produces. It's a stark demonstration of how quickly and unpredictably air quality can go downhill.

For you here in the UK, the direct physical threat from this particular haze is pretty minimal. But it does serve as a clear example of how airborne particles and gases from events happening thousands of miles away can have an impact on global atmospheric conditions, and research into the link between air pollution and mental health is increasingly drawing connections between environmental quality and emotional wellbeing. Getting your head around the health effects of this kind of smoke is relevant for anyone who cares about their respiratory wellbeing, really. We cover this in more depth in racist abuse mental health effects children. If you want the fuller picture, our guide to celebrity divorce stress health effects goes further.

What exactly is in wildfire smoke?

When vegetation and other materials burn, they don't just turn to ash. They create a complex mixture of gases and fine particles, and that's what we call smoke. The most concerning bit for your health is the particulate matter, particularly something called PM2.5. These are particles less than 2.5 micrometres in diameter – we're talking about something about 30 times smaller than the width of a human hair.

Because they're so tiny, they can get deep into your lungs when you breathe in. Some of them are even small enough to get into your bloodstream. The smoke isn't just particles, either. It's also packed with carbon monoxide, volatile organic compounds, and other irritant gases that can cause immediate discomfort to your eyes, nose, and throat.

How does smoke from so far away affect UK air?

You might be wondering how a fire in Indonesia could possibly have any bearing on the air you're breathing in Manchester or Edinburgh. The dense, visible plumes of haze are very much a regional problem. However, smoke from really big wildfires can get lofted high up into the atmosphere and then carried around on global wind patterns.

This can sometimes lead to hazy skies and a subtle, but measurable, increase in background levels of particulate matter, even thousands of miles away from the source. The effect is usually pretty minor compared to local pollution sources like traffic. Still, it all adds to the overall air quality picture, and for people who are sensitive to it, even small changes can sometimes matter.

What are the immediate health effects of inhaling smoke?

If you were directly exposed to wildfire smoke, the effects would be somewhat similar to a bad day in a heavily polluted city, but often more intense. Common short-term symptoms people experience include:

Coughing and a scratchy throat.
Irritated sinuses and a runny nose.
Stinging, watery eyes.
Shortness of breath or wheezing.
Chest tightness or palpitations.

For most healthy adults, these symptoms are temporary and should resolve once you're no longer exposed. They are, however, a clear signal that your body is reacting to an irritant.

Who is most at risk from poor air quality?

Certain groups are far more vulnerable to the health effects of smoke and airborne particles. The NHS page on air pollution, which they update regularly, puts it plainly: people with pre-existing conditions need to be particularly mindful. Those at higher risk include:

People with asthma or chronic obstructive pulmonary disease (COPD).
Those with heart disease or a history of stroke.
Children, whose lungs are still developing.
Older adults.
Pregnant women.

For these individuals, exposure to high levels of particulate matter can trigger severe symptoms, such as asthma attacks, and may lead to increased hospital admissions.

The most important section: Long-term concerns

The biggest worry from repeated exposure to smoke, or long periods of poor air quality, isn't the immediate irritation. It's the potential for long-term harm. Fine particles, or PM2.5, are considered one of the most harmful parts of air pollution. Research, including studies published in journals like The Lancet, has linked long-term exposure to elevated PM2.5 levels with serious health problems.

These particles cause inflammation not just in the lungs but throughout the entire body. This kind of chronic inflammation is understood to contribute to the development of cardiovascular diseases over time. It can speed up the hardening of arteries and increase the risk of heart attacks and strokes.

There's also strong evidence connecting long-term PM2.5 exposure to reduced lung function growth in children and the development of chronic respiratory diseases in adults. It may even worsen existing conditions like diabetes. Honestly, a single smoke event from Indonesia poses little long-term risk to someone living in the UK. But it's part of a global pattern of worsening air quality. Repeated exposure to poor air, from any source, is a serious health consideration. This isn't about panic over one event; it's about understanding the cumulative impact of the air we breathe.

🔬 Key Facts

The Science of PM2.5 Particles

→ Size: Less than 2.5 micrometres in diameter (approx. 30x smaller than a human hair).
→ Penetration: Small enough to bypass lung defenses and enter the bloodstream.
→ Systemic Impact: Causes inflammation throughout the body, contributing to cardiovascular risks.
→ Long-term Risk: Linked to reduced lung growth in children and chronic respiratory disease.

How can you protect yourself?

On days when air quality is poor, whether that's down to local pollution, Saharan dust, or distant smoke, there are practical steps you can take. The UK government provides daily air quality forecasts through sites like Defra's UK-AIR. It's a good habit to check these, especially if you’re in a vulnerable group.

When air quality is rated 'Poor' or 'Very Poor', you should consider:

Limiting prolonged or strenuous outdoor activity, especially near busy roads.
Keeping windows closed during peak pollution hours.
Using air purifiers with HEPA filters indoors if you have one.
If you have a respiratory condition, make sure you have your reliever inhaler to hand.
Avoiding other irritants like wood-burning stoves or smoky environments on those days.

How wildfire smoke from Indonesia can affect your health: what it means for you.

Frequently Asked Questions

Can wildfire smoke from Indonesia cause haze in the UK?

You're not going to see visible haze from Indonesia in the UK. It's highly unlikely. The smoke disperses over thousands of miles, mixing into the atmosphere. While it can contribute a tiny amount to background particle levels, any noticeable haze you see here is far more likely caused by local pollution, weather patterns, or dust from the Sahara.

I have asthma. Should I be worried about this specific fire?

The direct risk to you in the UK from the Indonesia fire is extremely low. However, it’s a good prompt to check your asthma action plan and be aware of local air quality forecasts. On any day when air quality is poor, follow your standard management plan and have your inhaler accessible.

Do face masks protect against smoke particles?

Standard cloth or surgical masks are not very effective against fine PM2.5 particles. A well-fitted FFP2 or N95 respirator mask can filter a significant portion of these particles, but they must be worn correctly. For most people in the UK, avoiding exposure and staying indoors is a more practical first step than relying on a mask.

How can I check the air quality in my area?

The Department for Environment, Food & Rural Affairs (Defra) runs the UK-AIR website. It provides a real-time air quality index and forecasts for regions across the UK. The BBC Weather app and website also include air quality data in their forecasts.

Will air purifiers help at home?

Air purifiers with a true HEPA filter can be effective at reducing the concentration of fine particles indoors. They are most useful in rooms where you spend a lot of time, like a bedroom. Keep windows and doors shut while running them for best results. They are a helpful tool for sensitive individuals during poor air quality episodes.

⭐ The Bottom Line

What this means for you

The wildfires in Indonesia are a serious regional crisis, demonstrating the power of nature to rapidly degrade air quality. For you in the UK, the direct threat is negligible, but the event is a powerful lesson in respiratory health. Poor air quality, from any source, can irritate airways, trigger asthma, and pose long-term cardiovascular risks. Your best defence is staying informed through official forecasts and taking simple precautions on days when the air quality is poor.

Last updated: 2026-09-17 · Written by the Walton Surgery editorial team · Medical information is for educational purposes only and does not replace advice from a qualified healthcare professional.