The Fire Is Out. But What About the Air?

The fire is out. The crew removed damaged materials, cleaned surfaces and addressed smoke odors. The restoration crew has packed up its equipment, and another project is coming to a close.

But before we shake hands and leave, there’s one more conversation worth having.

What’s the homeowner’s plan for the indoor air environment?

Several years ago, I became involved with a home in Plainville, Connecticut, where a garage fire had caused extensive damage.

The garage was a total loss, but the main living areas escaped significant direct fire damage. Smoke, however, had made its way into the house.

A local restoration company performed a thorough, top-to-bottom cleaning. The homeowners eventually moved back in, but something still felt off.

They could still smell the fire.

We were brought in to investigate. After collecting samples, taking environmental readings and evaluating the home, we found substantial accumulations of fire-related particulate matter and debris in the central HVAC ductwork.

The restoration team hadn’t cleaned the ductwork.

The visible living spaces were addressed, but an important part of the home’s air distribution system was overlooked.

This isn’t about criticizing the restoration company or suggesting every fire-damaged home needs duct cleaning. Experienced professionals know that the appropriate scope depends on the conditions.

But that experience reinforced something important: Sometimes the biggest challenge isn’t what we’ve cleaned. It’s what we haven’t considered.

The Connection Between Surfaces and Air

Restoration professionals understand the importance of removing damaged materials, soot, ash and smoke residues.

But surfaces and air don’t operate independently.

Particles settle. Everyday activities disturb them. Some become airborne again.

This process, known as resuspension, is one reason source removal and thorough cleaning matter so much. Air filtration can help reduce airborne particles, but it cannot replace removing contamination from the building itself.

And the principle extends beyond structure fires.

Consider the wildfire smoke events we’ve experienced in recent years. Fine particles can enter buildings far from the flames, settle onto indoor surfaces and potentially become airborne again.

The extent of contamination may differ greatly from a structure fire, but the underlying principles are familiar. A building doesn’t have to burn to be affected by smoke.

Are We Removing the Problem or Treating the Symptoms?

Our industry offers a range of tools to address persistent smoke odors, including chemical fogging, ozone treatments and chlorine dioxide gas.

Experienced restoration professionals understand that these technologies have different applications, limitations and safety requirements. But one distinction is worth considering.

When we apply a chemical treatment, are we removing contamination, chemically transforming it or reducing the associated odor? Those aren’t necessarily the same outcome.

Ozone is a respiratory irritant and can react with indoor chemicals to create additional compounds. Chlorine dioxide can react with certain odor-producing substances, but it also poses inhalation hazards at elevated concentrations. Appropriate product selection, application procedures, exposure controls, ventilation and reentry requirements matter.

This isn’t an argument against every chemical treatment. It’s a reminder that eliminating an odor doesn’t automatically establish that the underlying contamination has been removed.

It’s similar to a principle we already understand from mold remediation. Killing mold doesn’t remove the allergenic material, and unless you correct the moisture problem, growth can return. Sometimes the solution isn’t another treatment. It’s taking another look at the source.

Measure, but Understand What You’re Measuring

We have more tools than ever to evaluate the indoor environment. Portable particle monitors can help identify changes in airborne particulate concentrations. Other instruments provide useful information about environmental conditions. But measurements need context.

A PM2.5 monitor cannot identify the source of the particles it detects. A general-purpose VOC monitor cannot identify every chemical present or establish that a building is safe for occupancy.

These instruments can support an investigation, but they don’t replace appropriate assessments, sampling when necessary, or restoration verification. The value isn’t simply in collecting numbers. It’s in knowing what those numbers mean—and what they don’t.

The Missing Conversation: An Indoor Air Exit Strategy

Here’s where I believe we can build on the excellent work our industry already does.

We develop scopes of work, follow established restoration procedures, evaluate building systems and document our results.

But what if we also incorporated an indoor air exit strategy into our final conversation with the homeowner? Not another complicated protocol. Not an unnecessary service. Just a practical discussion about caring for the indoor environment after the restoration is complete.

I’d begin with two foundational considerations: moisture control and particle management.

Moisture control matters because unresolved water intrusion and elevated relative humidity can create conditions that support mold growth and other problems. For many homes, maintaining indoor relative humidity around 30% to 50%, where practical, is a useful goal.

Particle management matters because the fire isn’t the only source of airborne particles a home will ever experience.

Cooking, cleaning, outdoor pollution and everyday activities continue long after restoration crews leave. So, what systems and practices are in place to manage those particles?

That might mean reviewing HVAC filtration and maintenance, discussing ventilation when outdoor conditions allow, or considering an appropriately sized, high-performance air purifier when additional particle reduction would help. And let’s not forget that particle filtration doesn’t address every gaseous contaminant. Source control and appropriate ventilation remain essential, and gas-phase filtration can help in certain circumstances.

Not every home needs the same solution.No air purifier can replace proper restoration, moisture control, or removing contamination at its source.

The goal isn’t to sell another product or extend the restoration project unnecessarily. It’s to give homeowners a practical plan for managing the indoor environment after our work is complete.

Three Questions Worth Asking Before We Leave

Imagine completing a restoration and adding three questions to the final homeowner conversation.

1. Moisture: Are there unresolved moisture concerns, and does the homeowner understand how to monitor and manage indoor relative humidity?
2. Particles: Have relevant HVAC components and potential contamination reservoirs been evaluated, and what ongoing filtration or air-cleaning measures are appropriate?
3. Moving forward: Does the homeowner understand how ventilation, filtration, maintenance, and everyday activities can influence the indoor environment?

The answers might lead to something as simple as replacing an HVAC filter on schedule, monitoring humidity, or adjusting ventilation practices. In other situations, they may point toward additional air-cleaning equipment or a referral to a qualified specialist.

These questions don’t replace professional standards, appropriate verification, or specialized environmental assessments. Nor do they create a new test for whether a building is safe to occupy.

They simply add useful education to the work we’ve already completed. And perhaps that’s the opportunity. Not necessarily doing more restoration work. Doing a better job connecting today’s restoration with tomorrow’s indoor environment.

Thinking Beyond the Restoration

The cleaning and restoration industry has invested decades in improving equipment, training, procedures, and professional standards, including ANSI/IICRC S700.

Building science doesn’t replace that expertise. It complements it.

Understanding how moisture, particles, ventilation, filtration, and building systems interact helps us see the indoor environment as a whole, not a collection of individual components.

It also gives homeowners something beyond a completed project.

Knowledge they can put to work.

The fire may be out. The soot may be gone. The smoke odor may have disappeared.

The restoration work may be complete.

But the homeowner’s relationship with the indoor environment continues every day.

We’ve restored the building. Now let’s help the homeowner understand how to care for the air they’ll breathe long after we’re gone.