Wildfire Smoke Is a Facility Safety Problem

This week, Canadian wildfire smoke pushed air quality alerts across 18 states, from the Great Lakes to the East Coast. Milwaukee recorded the worst air quality in its history. Detroit, Minneapolis, and Chicago ranked among the most polluted cities on the planet, and New York woke up to orange skies with readings deep into the unhealthy range. With more than 850 fires still burning in Canada, forecasters expect the smoke to return in waves for weeks.

This is no longer a rare event. In June 2023, New York briefly held the worst air quality of any major city in the world. Two years later, smoke days like this one are a recurring part of the summer. That makes them a continuity problem, and continuity problems get solved in advance, on the calm days before the next plume arrives.

If the sky is orange today

When a smoke event is already underway, work it in order and keep it simple.

Learn to read one number

The Air Quality Index compresses several pollutants into a single scale, but during a smoke event the number is driven almost entirely by PM2.5: particulate matter under 2.5 microns. These particles are small enough to reach deep into the lungs and pass into the bloodstream. They are what makes wildfire smoke a serious health hazard.

The scale runs in bands, and each band is an instruction:

Deciding what your organization does at each band is a fifteen-minute exercise on a clear day. It is an impossible one when the smoke has already arrived and someone is asking whether the loading dock crew should keep working.

Indoors only helps if the air is cleaner

The standard advice during a smoke event is to go indoors. That advice assumes the indoor air is cleaner than the outdoor air. Whether that is true depends entirely on your HVAC system, and most operators have never checked.

A building that pulls in outside air through low-grade filters spreads smoke evenly through every room. Fine particulate passes straight through filters rated below MERV 13. Systems that cannot be switched to recirculation keep drawing the smoke in as long as the event lasts.

Sending people indoors only protects them if indoors is actually cleaner. For a lot of buildings, no one has ever confirmed that it is.

The questions worth answering before a smoke event are concrete. What is the filter rating on each air handler. Can the system be set to recirculate and cut outside intake. Which rooms hold their air quality and which do not. Where would you consolidate people if you needed a genuinely clean zone. A facility that knows these answers can give staff a clear, confident instruction.

The decision no one wants to own

Every smoke event forces a chain of judgment calls. Do outdoor crews keep working. Do you cancel the shift, the event, the delivery. Do you send people home, and if so, into the same bad air. Do you stay open for a workforce that has to commute through it.

These decisions are hard in the moment because the tradeoffs are real. They become much easier when the thresholds are set in advance and one person clearly owns the call. Without that, the decision defaults to whoever is most senior in the room, improvising, under pressure, with no agreed standard. That is how organizations end up defending a choice they never actually made.

Customers and visitors count too

If the public moves through your space, their exposure is your responsibility.

Any organization that brings the public through its doors carries a duty of care to them during a smoke event. Customers, patients, students, and visitors arrive with no warning about the air and little control over how long they stay. Retail floors, clinics, schools, venues, and hospitality sites all need a plan for the people they serve, alongside the one for staff.

• Move waiting areas, queues, and seating out of outdoor or poorly filtered space.
• Postpone or relocate outdoor customer activities: patios, tours, events, recreation, and curbside lines.
• Post clear signage and update your website and phone line whenever hours or services change.
• Give frontline staff a short script for questions about the air and what you are doing about it.

Communication is the plan

A smoke plan that lives in a binder does nothing when the air turns. What protects people is the ability to reach every affected worker quickly with a clear instruction: stay home, come in late, move indoors, shift is canceled. That capability is a mass notification system, like the ones WorldSafe deploys through AlertMedia, with current contact information and pre-written messages, tested before it is needed.

This is the same operational reality behind every other continuity event, from severe weather to an active threat. The organizations that handle smoke well are the ones that decided ahead of time what happens at each threshold, who owns the decision, and how the message goes out.