Wildfire Season Has Become a Business Risk Every Facility and CRE Leader Should Plan For in 2026

Wildfire season strains buildings and people. See how facilities can prepare in 2026 to reduce costs, protect tenants, and build resilience.

Ava Montini

Mar 11, 2026

Written by

Published on

The Business Side of Smoke Days

When wildfire smoke drifts into a region, the strain on buildings is both immediate and multi-layered. Filters load faster, pushing fans to use more power just to keep airflow steady (EPA). As systems deviate, alarms trigger more frequently, and maintenance teams are pulled from planned tasks into reactive changeouts (Facility Executive). Meanwhile, vendors across the region see surging demand; parts and pads that usually arrive in days might take a week or more (NC State). That delay alone can unravel even the most rigorously planned preventive maintenance schedules.

Inside the building, occupants feel a different side of the same event. They note scratchy throats, irritated eyes, or rooms that feel stale or “heavier” when fresh air intake is reduced (AirNow). They see Air Quality Index alerts on their phones and news headlines escalating (EPA AQI). In those moments, the question is no longer just whether systems are responding, it’s: Is the building protecting me? When communication is missing or unclear, perception can trump technical measures, tipping the balance from confidence to complaints (BOMA).

Why It Matters More in 2026

The stakes are rising. Multiple studies show that during wildfire events, indoor air can reach one-third to three-quarters of outdoor particulate concentrations in buildings lacking robust mitigation (PMC). Residential buildings in fire-affected areas have shown infiltration ratios reflective of this risk (PMC). In some wildfire-impacted care environments, indoor concentrations have peaked near 200 µg/m³ (NCBI). In contrast, well-configured filtration systems often reduce that exposure to roughly 43% of outdoor levels, showing how effectively mitigation can work (NCCEH).

The human health impacts are significant. Fine particulate matter (PM₂.₅) is linked to asthma flare-ups, reduced lung function, and cardiovascular stress (EPA). Sensitive populations (children, older adults, and those with pre-existing conditions) are most at risk (CDC). However, research also shows that even healthy adults are not immune to short-term exposure (PubMed). Harvard-led studies estimate that wildfire smoke has caused over 15,000 premature deaths in the U.S. in recent decades, with an associated economic burden of $160 billion (Harvard). For employers and property leaders, this translates into absenteeism, healthcare costs, and measurable productivity loss (National Bureau of Economic Research).

At the same time, smoke is a mechanical stressor. It accelerates filter clogging, pushes fans outside their normal operating range, and drives up energy consumption (ScienceDirect). Facility executives consistently report higher unplanned maintenance costs during wildfire season, along with shortened asset life for critical HVAC equipment (Facility Executive). Viewed at scale, these costs ripple upward into operational budgets and capital planning, making smoke days not just a maintenance issue but a financial liability.

What Smoke Events Do to Commercial HVAC Systems

Wildfire smoke can be seen as just “dirty air", but to get deeper, it is a dense mix of ultrafine particles, ash, organic compounds, and combustion byproducts that behave differently from typical urban pollution.

When these particles enter HVAC systems, three operational challenges occur simultaneously:

Rapid filter loading and front loading: Fine smoke particles quickly accumulate on the front face of filter media rather than distributing evenly through the depth of the filter. This “front loading” effect increases resistance to airflow much faster than normal particulate loading.
Fan energy increases: As pressure across the filter bank rises, fans must work harder to maintain airflow.
Airflow imbalance: Systems designed for stable pressure conditions may struggle to maintain balanced ventilation across zones.

During heavy smoke events, these mechanical effects can compound quickly. What begins as a minor filtration issue can cascade into comfort complaints, airflow deviations, and unexpected service calls.

Rethinking Preparedness

Preparedness today requires more than having spare filters in storage. Facilities that treat smoke season as part of their risk portfolio are proving more resilient. Research shows that buildings operating with lower baseline pressure drops have more headroom when smoke events occur, allowing systems to maintain airflow without tipping into alarm states (ScienceDirect). Forward-looking teams also map their most critical zones (like labs, classrooms, care units, or executive suites) and prioritize them during smoke events, an approach recommended in EPA guidance for schools and commercial buildings (EPA).

Another resilience factor is vendor readiness. Case studies after the 2020 smoke season showed that supply chain bottlenecks caused delays of days to weeks in replacing filters and components, leaving unprepared facilities exposed (NC State). Facilities that negotiated priority contracts in advance were able to maintain schedules even during regional demand surges. Similarly, using AQI forecasts and on-site PM₂.₅ sensors has been shown to improve response times; by acting early, facilities reduce exposure and minimize tenant complaints (PMC).

Wildfire readiness also intersects with broader sustainability and ESG commitments. Poor indoor air quality during smoke events undermines health-related certifications like WELL and LEED, while higher fan energy use increases a building’s carbon footprint (USGBC; IWBI). Integrating smoke resilience into ESG strategies provides measurable benefits for investors and stakeholders while demonstrating a proactive approach to tenant wellness.

Three Questions Facility Leaders Should Ask Before Smoke Season

Forward-looking facility teams increasingly treat wildfire smoke the same way they treat winter storms or heat waves: as a seasonal operational risk.

Before wildfire season begins, three questions can help identify vulnerabilities:

1. How much airflow headroom does the HVAC system have?

Buildings operating near maximum pressure limits may struggle when filters load rapidly during smoke events.

2. Are replacement filters and components secured in advance?

Regional smoke events often trigger sudden demand spikes, delaying shipments and increasing costs.

3. Are response protocols clearly defined?

Teams should know when to increase filtration, adjust outdoor air intake, and communicate with tenants.

Facilities that answer these questions early often respond faster and maintain better building performance during smoke days.

The Bottom Line

Facilities without strong preparedness can see indoor pollutant levels rise to 75% of outdoor concentrations during wildfire events, while prepared buildings cut that exposure nearly in half (NCCEH). Harvard-led analyses estimate that wildfire smoke causes tens of billions of dollars in annual economic damage, largely through absenteeism and healthcare costs (Harvard). From a mechanical standpoint, smoke accelerates filter clogging, forces fans to operate at higher energy use, and shortens asset lifespan, driving up costs across operations and capital planning (Facility Executive).

The buildings that are prepared today will reduce alarms, complaints, and unplanned expenses tomorrow, while earning the trust of the people inside. Tenants will remember which buildings felt steady, cared for, and resilient when the outside air was anything but.

MERV 8 vs MERV 11: Which is Better?

Jennifer Crowley
Jul 28, 2023
4 min read

Updated: Jul 9, 2024

Dirty furnace filter laying atop a clean filter — When comparing MERV 8 and MERV 11 filters, it is important to consider their particle capture capabilities, air flow rates, pressure drops, and costs.

MERV (Minimum Efficiency Reporting Value) is a rating system that measures the effectiveness of air filters in capturing particles of different sizes. The MERV rating scale ranges from 1 to 20, with higher numbers indicating greater efficiency in capturing smaller particles.

In this blog post, we will compare two standard MERV ratings for air filters: MERV 8 vs MERV 11. We will discuss the pros and cons of each type, their particle capture capabilities, air flow rates, pressure drops, and costs, as well as provide guidance on choosing between the two.

What is MERV 8?

MERV 8 filters can capture particles that are 3 to 10 microns in size, such as

Pollen
Dust mites
Pet dander

They are less expensive and allow for higher airflow rates than higher MERV-rated filters, making them a good choice for systems with high airflow needs. However, MERV 8 filters may not capture smaller particles that can cause respiratory problems, such as mould spores and bacteria. They must also be changed more frequently than higher-rated filters to maintain effectiveness.

What is MERV 11?

MERV 11 filters can capture particles that are 1 to 3 microns in size, such as:

Pollen
Dust mites
Mould
Large dust particles
Auto emissions
Fine air particles
Pet dander
Lint
Smoke
Smog
Bacteria

MERV 11 filters offer better filtration than MERV 8 filters and can help improve indoor air quality for people with allergies or respiratory problems. However, they are also more expensive and can restrict airflow more than MERV 8 filters. When the airflow is restricted, it can lead to discomfort, higher energy consumption, and faster wear and tear of HVAC equipment. Using an air filter with a MERV rating that exceeds your system’s recommended level can be particularly damaging, causing harm to the compressor, heat exchanger, and air conditioner coil.

Comparison of MERV 8 vs MERV 11

When comparing MERV 8 and MERV 11 filters, it is important to consider their particle capture capabilities, air flow rates, pressure drops, and costs.

Particle capture Comparison chart of MERV 8 Vs, MERV 11 — MERV 11 filters more effectively capture smaller particles than MERV 8 filters.

Particle capture capabilities: MERV 11 filters more effectively capture smaller particles than MERV 8 filters. This means they can help improve indoor air quality and reduce the risk of respiratory problems. However, MERV 8 filters may be sufficient for capturing larger particles like pollen and dust, which can also contribute to indoor air pollution.

Air flow rates: MERV 8 filters allow for higher airflow rates than MERV 11 filters. This means they may be a better choice for standard HVAC systems with high airflow needs, such as commercial buildings that don’t require superior air filtration. MERV 11 filters can restrict airflow more than MERV 8 filters, which can cause strain on HVAC systems and potentially increase energy costs.

Pressure drops: MERV 11 filters can cause higher pressure drops than MERV 8 filters, further straining HVAC systems and reducing energy efficiency. Choosing the right filter for the specific system is essential to avoid this issue.

Costs: MERV 11 filters are generally more expensive than MERV 8 filters, which can be a factor for those on a tight budget. Additionally, MERV 11-rated filters get clogged much more quickly than a MERV 8 filter and have to be replaced frequently.

How to Choose Between MERV 8 and MERV 11?

When choosing between MERV 8 and MERV 11 filters, it is crucial to consider the HVAC system’s and its occupants’ specific needs. Here are some factors to consider:

Types of particles present: If your system needs to capture smaller particles like mould spores or bacteria, a MERV 11 filter may be more appropriate. If it only needs to capture larger particles like pollen and dust, a MERV 8 filter may suffice.

Air flow rate required: If your system requires high air flow rates, a MERV 8 filter may be a better choice. However, if indoor air quality is a higher priority and airflow rates can be sacrificed, a MERV 11 filter may be a better choice.

Budget available: A MERV 8 filter may be more cost-effective if the budget is a concern. However, if indoor air quality is a higher priority and a higher initial cost can be justified, a MERV 11 filter may be a better choice in the long run.

Occupant health concerns: If occupants have allergies or respiratory problems, a MERV 11 filter may be more appropriate to help improve indoor air quality and reduce the risk of health issues. However, if no health concerns are present and your system only needs to capture larger particles, a MERV 8 filter may be sufficient.

In summary, MERV 8 and MERV 11 filters both have their advantages and disadvantages and choosing between them depends on your HVAC system’s specific needs and occupants. While MERV 11 filters offer better particle capture capabilities and improved indoor air quality, they also come with higher costs and potential airflow restrictions. On the other hand, MERV 8 filters allow for higher air flow rates and are more cost-effective but may not capture smaller particles that can cause health problems. It is important to weigh these factors carefully and consult a professional to determine the best filter for your system.

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