Using the Dutch Stookwijzer: How Weather Affects Wood Smoke

A still, cold evening may seem ideal for lighting a wood stove, yet those same conditions can leave smoke lingering around neighbouring homes. Checking the Dutch Stookwijzer before you light up helps you judge when weather and air quality make wood burning particularly troublesome.

The advice is useful for both regular stove users and homeowners planning a fireplace installation. A well-maintained appliance and suitable flue matter, but the atmosphere outside also determines where its smoke goes.

Stookwijzer explained: reading the colour codes

The Stookwijzer combines forecast wind strength and air quality to give advice for Dutch four-digit postcode areas. Check the official Dutch Stookwijzer for your location before preparing a fire, and read the advice for the period when you intend to burn.

Its three colours mean:

There is deliberately no green category: wood burning produces pollution even when smoke disperses relatively well. Yellow therefore does not guarantee that neighbours will experience no nuisance.

Under the current criteria, wind force 2 or lower on the Beaufort scale results in red advice. When wind strength is higher, the advice also depends on the existing concentration of fine particles, known as PM2.5. A breezy day can still receive orange or red advice if air quality is poor.

Check the relevant time period

The current advice uses six-hour blocks: 04:00–10:00, 10:00–16:00, 16:00–22:00 and 22:00–04:00. The current block and the next block are fixed; forecasts for later periods can still change.

Check the date and time alongside the colour. If you expect a fire to continue into another block, look at that period too. For example, yellow advice during the afternoon does not tell you whether conditions will be suitable later that evening.

The Stookwijzer uses model calculations. Conditions immediately around your chimney can differ from those forecast for the wider postcode area.

How weather and wood smoke interact

Smoke dispersal depends on both horizontal movement and vertical mixing. Wind helps move and dilute a plume, while the temperature structure of the atmosphere affects how readily it mixes upwards.

Light winds allow smoke to accumulate

With little wind, smoke disperses slowly. Emissions from one chimney can linger nearby, and several fires burning in the same neighbourhood can add to the local concentration.

Wind direction matters too. A plume travelling away from your own garden may head directly towards a neighbour’s bedroom window or ventilation inlet.

Stronger wind usually improves dilution, but buildings can redirect airflow. Conditions at a sheltered terrace or courtyard may be very different from those in an open field nearby.

Temperature inversions restrict vertical mixing

Normally, air temperature decreases with height through the lower atmosphere. During a temperature inversion, a layer of warmer air sits above cooler air near the ground. This stable arrangement restricts vertical mixing, allowing pollution to accumulate beneath it.

Inversions can develop when the ground cools on clear, calm nights. These conditions help explain why smoke may become more noticeable after sunset, even if the afternoon seemed favourable.

Cold weather alone does not prove that an inversion is present. Fog can accompany stable conditions, but an inversion can also occur without visible fog. Use the Stookwijzer rather than trying to diagnose the atmosphere from temperature or visibility alone.

Local surroundings affect the plume

Nearby roofs, taller buildings and trees influence airflow around a chimney. Turbulence can carry smoke down towards gardens or façades, particularly where a flue outlet is poorly positioned relative to surrounding obstacles.

A stove drawing well indoors does not establish that its smoke disperses well outdoors. Persistent complaints deserve attention even when the Stookwijzer shows yellow.

Practical ways to reduce nuisance for neighbours

Choosing when to burn is one part of reducing smoke. Fuel, appliance operation and the flue also matter.

• Follow orange and red advice. Postpone the fire and use another heating source.
• Use dry, untreated firewood. Damp wood burns poorly. Painted, treated or glued wood and household waste are unsuitable fuels.
• Follow the appliance instructions. Use the specified fuel load, lighting method and air settings. Restricting air to prolong a fire can encourage smoky, incomplete combustion.
• Maintain the stove and chimney. Arrange appropriate servicing and sweeping, and have recurring draught or smoke problems investigated.
• Respond to local signs. Smoke lingering between houses or repeatedly reaching neighbouring windows is a reason to avoid further burning.
• Talk to neighbours. Ask when and where they notice smoke. Their observations can reveal a pattern involving wind direction or evening conditions.

If nuisance develops while a fire is already burning, stop adding fuel and follow the manufacturer’s instructions for letting it burn out safely. Do not close the air supply to make it smoulder.

Using the advice when planning an installation

Before choosing a wood stove, consider how often unfavourable conditions might limit its use and what other heating will be available. Check your municipality’s current rules as well: some municipalities restrict burning during orange or red advice.

For an installation assessment, give the specialist information about neighbouring buildings, roof heights and nearby ventilation openings. These details help them evaluate the flue route and outlet position.

Keep checking the Stookwijzer once the appliance is in use. Pair its advice with observations around your home and feedback from neighbours, and leave the fire unlit whenever conditions are unsuitable.