What Wildfire Smoke Days Feel Like From A Facility vs. Tenant Perspective

Wildfire smoke is a load event for buildings. Discover strategies to protect systems, tenants, and budgets during smoke season.

Ava Montini

Feb 10, 2026

Written by

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Setting the stage: smoke isn’t just outdoors

We all know the feeling: one day the sky is clear, and the next, the horizon turns hazy. Wildfire smoke doesn’t stay in the forest. It drifts hundreds of kilometers, carrying fine particles (PM₂.₅) and gases that make their way into our cities and, inevitably, our buildings (EPA).

And once smoke is outside, it doesn’t stop at the front door. Even the best-sealed buildings aren’t immune. It slips in through HVAC intakes, leaky windows, door gaps, and loading docks (EPA Schools & Commercial Buildings). Studies show that indoor air during heavy smoke events can reach one-third to three-quarters of outdoor levels if buildings aren’t prepared. That means tenants still feel it, and facility teams are left carrying the pressure.

What’s important to understand is that smoke days aren’t rare exceptions, but rather annual seasonal events. And like snowstorms or power outages, they’re “load events” that strain systems, stretch teams thin, and test how well a building can protect the people inside.

The facility side of smoke days

For facility teams, smoke days are a stress test for people, systems, and processes.

When smoke enters a region, the operational load spikes almost immediately. Filters clog faster than expected, which forces fans to work harder to maintain airflow. Research shows filter performance can drop rapidly in smoky conditions while resistance builds more slowly, pushing systems off their normal operating curve (Arxiv).

On the ground, that means alarms trip more often, unplanned changeouts eat up staff hours, and tenant tickets pile up faster than they can be resolved. Leadership often asks for reports on energy use, tenant comfort, and risk status—while teams are still mid-response. And because fans are working harder, energy use climbs, putting additional strain on operating budgets (Facility Executive).

In short, a smoke day forces facility managers to balance three competing demands at once:

Keep systems running under abnormal load.
Manage communication with tenants and leadership.
Solve logistical problems like vendor delays and staff shortages.

That’s why wildfire season needs to be treated as a predictable operational load event, not an occasional anomaly.

The tenant experience

When wildfire smoke affects a region, the people inside buildings notice quickly, even if they don’t know the technical details.

Common physical effects include dry eyes, scratchy throats, mild headaches, or fatigue, which are linked to fine smoke particles (PM₂.₅) that can still enter buildings despite filtration (AirNow). Occupants may also notice a faint smoky odor in hallways or shared spaces. These cues, though subtle, signal that the outside environment is affecting indoor comfort.

Another frequent observation is that rooms feel “stale” or stuffier. This often happens because outside air intake is reduced to keep smoke out, meaning less fresh air circulation than usual. While this is a standard operational response, it can leave tenants feeling like the air is heavy or stagnant.

There’s also a psychological component. Air quality alerts on phones and news headlines make people more aware of the situation. Without clear building communication, tenants can feel uncertain about whether enough is being done. Research shows that when people don’t understand what’s happening indoors during smoke events, their perception of safety declines, even if actual pollutant levels are controlled (BOMA Frontline).

From a wellness perspective, most healthy adults recover quickly from brief exposures. But sensitive groups (children, older adults, and those with asthma or heart disease) can experience stronger impacts from even short-term smoke exposure (EPA). That makes communication and reassurance especially important in spaces like schools, healthcare facilities, and multi-tenant offices.

In short, while facility teams see smoke days as operational stress events, tenants experience them as comfort and confidence events. Their main concern is whether the air feels safe and whether the building is taking the situation seriously.

Two Sides of the Same Story

Smoke days are one event experienced two ways.

For facility teams, it’s alarms, supply delays, energy spikes, and leadership expecting answers while staff juggle urgent tasks. For tenants, it’s the everyday signals—scratchy eyes, a smoky odor, or rooms that feel stuffy. One side is measured in workloads and KPIs; the other in comfort and confidence.

Preparation closes the gap. When facilities are ready, operations stay steady, complaints drop, and tenants feel looked after. The result isn’t just smoother performance—it’s trust in the building when it matters most.

What preparedness really looks like

1. Map and tier “critical zones”

Not all spaces are equal. Facility teams can gain disproportionate impact by identifying critical zones (areas where tenant perception, operations, or health sensitivity is highest) and prioritizing those for tighter control, filtration, and supplemental support.

For example, during wildfire smoke events, schools, clinics, or labs are often given priority for cleaner air interventions. This approach aligns with state policies recommending that public buildings adopt tiered responses based on use and occupant vulnerability. Environmental Law Institute

2. Pre-arrange vendor or priority supply contracts

In smoke events, supply chains buckle under surging demand. Facilities that pre-negotiate vendor priority, emergency allocations, or just-in-time buffer arrangements stand a much better chance of holding ground when the market tightens. In climate risk and infrastructure planning, supply chain resilience is a strong theme; analysts now argue that the key differentiator for resilient systems is not just resource availability but pre-arranged capacity under stress. World Economic Forum Reports

3. Automate or pre-approve communication templates

When wildfires hit, everyone expects clarity. Having short, plain-language messages pre-approved (for tenants, staff, and leadership) shaves off triage time. Some public health programs now include modular communication templates for smoke alerts to streamline action and reduce confusion. Environmental Law Institute

4. Model trends, not thresholds

Facilities often react only when alarms or thresholds are crossed. But resilient operators build trend models (observing how PM, pressure differentials, or load drift over hours or days) and use those to anticipate trouble. This predictive mindset mirrors how climate-adaptive infrastructure planning uses trends over thresholds to trigger safeguards. World Economic Forum Reports

5. Use smoke events as resilience tests

Smoke days offer a live scenario to stress systems—mechanical, staffing, and communications. Smart teams treat them like drills: “If this fails, how do we pivot?” Incorporating smoke days into broader resilience plans ensures that those learnings carry forward to other stresses, not just wildfire. Morrison-Maierle

6. Connect the plan to ESG, risk, and stakeholder value

The case for wildfire preparedness becomes much stronger when tied to ESG metrics, tenant trust, and operational risk. As cities and regulators increasingly expect buildings to account for climate-related risk, having a wildfire readiness plan becomes a tangible proof point, in both operations and investor/tenant confidence. knowledge.uli.org

The research voice: why it matters

During the 2020 wildfire season, monitoring across multiple buildings found that facilities using high-efficiency filtration strategies kept smoke exposure almost 50% lower than unprotected buildings. Median indoor/outdoor ratios were 0.43 vs. 0.82 (Arxiv). In elder care facilities, indoor concentrations still peaked between 43.6 and 202.5 µg/m³ depending on design and filtration, with infiltration rates ranging from 22% to 76% (PubMed). By comparison, wildfire-specific studies show well-filtered buildings sometimes kept indoor PM₂.₅ under 15 µg/m³, while unprotected ones averaged closer to 34 µg/m³ (NCCEH).

The health impacts scale with those numbers. Fine particulate matter (PM₂.₅) is strongly linked to coughing, aggravated asthma, reduced lung function, cardiovascular stress, and premature death. A Harvard-led study estimated that wildfire-driven smoke caused 15,000 premature deaths in the U.S. from 2006–2020, with an economic burden of $160 billion (Harvard). Even short-term exposure can increase hospital admissions and ER visits for respiratory and cardiac conditions (AirNow).

And it isn’t just about people. Mechanical stress rises too. Heavy smoke loads accelerate filter clogging, drive fan energy use higher, and shorten HVAC asset life. Facility executives consistently report that smoke seasons push unplanned maintenance costs upward and increase downtime risk (Facility Executive).

The takeaway is simple: smoke days are expensive on every front. Facilities that plan ahead don’t just protect health, they protect budgets, reduce downtime, and maintain tenant trust when it matters most.

Smoke days aren’t just operational challenges—they’re human ones.

Smoke days remind us that facilities operate at the intersection of systems and people. For teams, they create extra load: more equipment checks, unexpected changeouts, and added reporting. For tenants, they create noticeable changes in comfort: air that feels heavier, irritation from particles, or the uncertainty that comes with health alerts.

Preparedness helps align those two experiences. When systems have margin and teams have a playbook, operations stay steadier, and tenants feel reassured that the building is being managed with care.

Research shows that good filtration can cut indoor smoke exposure nearly in half, lower health risks for sensitive occupants, and reduce the unplanned maintenance costs that often follow heavy smoke days.

But the bigger insight is this: preparedness pays off twice. First in operational efficiency, and again in tenant trust.

Resilience, then, isn’t just about surviving smoke season. It’s about designing facilities to handle disruptions as part of normal operations. Two worlds, one building and the preparation you do now sets the tone for how both will experience the next smoke event.

Why MERV 13 Filters May Be Straining Your HVAC & What to Do Instead

Ava Montini
Jul 31, 2025
3 min read

In the race to improve indoor air quality (IAQ), MERV 13 filters quickly became the default solution. Backed by ASHRAE recommendations and often mandated for LEED, WELL, and government-funded retrofits—particularly in schools and healthcare settings—they offer fine-particle capture down to 0.3 microns.

And the promise is compelling: better protection against smoke, allergens, pathogens, and pollution.

But what happens when a filter built for high capture also comes with high resistance?

That’s the overlooked issue facilities teams across North America have quietly (and not so quietly) been contending with since the industry-wide pivot to pleated MERV 13 filtration. And it’s exposing a critical gap between policy and practicality.

The Unseen Burden

Pressure Drop and System Strain

MERV 13 filters do deliver on filtration performance. But many commercial buildings weren’t designed with the added pressure resistance these filters introduce. Especially older or heritage buildings. This added strain reduces efficiency and risks long-term operational degradation, especially in decentralized HVAC systems like fan coil units, packaged rooftop units, and older RTUs.

Pressure drop, the measure of air resistance across a filter, directly influences fan performance, motor longevity, and energy consumption. As resistance rises, so does the system’s workload. What’s often missed in blanket retrofit strategies is that denser filters may clean more, but they also constrict more.

Common downstream effects include:

Fan overwork, leading to overheating or premature failure
Uneven airflow, resulting in occupant discomfort
Shorter filter lifespan, increasing maintenance load
Higher energy bills, due to compensating fans or longer run times

Peer-reviewed research and government data confirm the operational penalties tied to high-resistance filtration.

According to the U.S. Department of Energy, when HVAC systems are not recalibrated or upgraded during a filter retrofit, increased static pressure can lead to a 20–30% rise in fan energy consumption, as fans work harder to maintain airflow under greater resistance.
A study presented at the ASHRAE IAQ 2013 conference by Zaatari, Siegel, and Novoselac found that rooftop HVAC units experienced airflow reductions of up to 10% when upgrading from MERV 8 to MERV 13 filters, largely due to increased pressure drop across the filter.
In its 2024 Filtration and Air Cleaning Position Document, ASHRAE confirms that increasing filter efficiency (e.g., upgrading to MERV 13 or higher) generally results in higher pressure drop, which can reduce airflow or increase energy consumption—especially in systems not originally designed to accommodate high-efficiency filters.

Despite this, many upgrades were executed rapidly, driven by pandemic urgency and available funding, and not necessarily by holistic HVAC engineering.

Rethinking the Role of the Filter

Not all MERV 13 filters are created equal.

It’s a common misconception that achieving high filtration efficiency must come at the cost of system performance. But advancements in filter design have shown that it’s possible to meet rigorous indoor air quality standards without overburdening HVAC systems.

Instead of relying solely on dense mechanical media that increase resistance, some technologies, such as Blade Air's Pro Filter, use innovative methods, such as electrostatic attraction, to capture fine and ultrafine particles more efficiently.

The benefits of low-pressure filtration approaches are clear:

Significantly reduced pressure drop, preserving system balance and efficiency
More consistent airflow, even in legacy or decentralized HVAC configurations
Lower energy consumption, due to decreased fan effort
Extended equipment life, with reduced strain on motors and fans
Sustainability gains, with designs that prioritize reusability and waste reduction

As building standards continue to evolve, it's worth reexamining whether the filter in use supports both compliance and long-term operational resilience.

Why Low-Pressure Filtration is Gaining Momentum

Facilities professionals today are tasked with a complex balancing act: maintaining high indoor air quality, advancing energy efficiency, extending equipment lifespan, and meeting evolving occupant expectations, all within constrained budgets.

Yet compliance alone isn’t enough. A filter that meets regulatory standards on paper may still introduce performance issues if it exceeds the mechanical limits of an existing HVAC system.

That’s why low-pressure filtration is gaining traction—not as a compromise but as a more strategic path forward.

These next-generation filtration approaches help building operators:

Avoid costly system redesigns or equipment upgrades
Reduce the frequency of service disruptions and maintenance interventions
Advance broader environmental and ESG goals through energy and waste reductions

Most importantly, they restore decision-making power to facilities teams, offering workable options instead of one-size-fits-all mandates.

Rethinking Retrofit Outcomes

If your facility has seen a rise in operational issues following a filtration upgrade, such as higher energy bills, comfort complaints, or premature equipment wear, you’re not imagining it. These are increasingly recognized as widespread challenges linked to high-resistance filters.

But the solution doesn’t necessarily require reengineering your system.

It starts with reexamining the filter itself, and whether it truly supports the way your building functions.

Because in high-performing buildings, air quality solutions should enhance operations, not compromise them.

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