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The Effect of Wildfire Smoke and IAQ

02/19/2025

Why Your Indoor Air Quality Matters During Wildfire Season (And What You Can Do About It)

If you've been following the news lately, you've probably seen those apocalyptic orange skies and smoke-filled horizons. But here's something that might surprise you: even if you're hundreds of miles away from the nearest wildfire, your indoor air quality could be at risk. Let's dive into what this means for you and your home.

The Smoke Doesn't Stay Where the Fire Is

Think smoke from wildfires only affects people living next door to the blaze? Think again. Those tiny particles from wildfire smoke are serious travelers, hitching rides on wind currents for thousands of miles. And they're not just passing through – they're bringing all sorts of unwanted health effects with them.

The World Health Organization isn't mincing words about this. They've classified the fine particulate matter from these fires as hazardous. We're talking about particles so small they can mess with your lungs, brain function, and nervous system. Not exactly the kind of houseguests you want to invite in.

Understanding Air Quality: It's Not Just Numbers

The EPA has this handy thing called the Air Quality Index (AQI). Think of it as a weather forecast for your lungs. Here's what those numbers really mean:

0-50: You're golden! The air is clean and clear. 51-100: Pretty good, but sensitive folks might want to take it easy. 101-150: If you've got asthma or other respiratory issues, heads up. 151-200: Everyone might start feeling it now. 201-300: Time to really pay attention – this isn't great for anyone. 300-500: Red alert! This is emergency territory.

Here's the kicker: during wildfire season, these numbers can skyrocket. And guess what? Your indoor air can actually be worse than outdoor air if you're not filtering it properly.

Your Building’s Defense Strategy: Commercial Air Filtration

Your HVAC system’s filtration is your primary defense against wildfire smoke. Here’s your strategic approach based on your building’s location:

For Buildings Near Active Fires

Implement activated carbon prefilters throughout your commercial HVAC system. These specialized filters act as a first line of defense against smoke odors and harmful pollutants. Institute an accelerated maintenance schedule – your filter systems require more frequent inspections and replacements during active fire events to maintain optimal performance and protect system efficiency.

For Buildings in Wildfire-Prone Regions

Upgrade your building’s filtration to MERV 13 filters across all air handling units. These commercial-grade filters capture 85% of airborne particles, significantly outperforming standard MERV 8 filters. Consider your building’s specific needs:

  • Large office buildings may require system modifications to handle the increased pressure drop
  • Healthcare facilities should consider even higher MERV ratings
  • Mixed-use buildings may need varied filtration solutions for different zones

Remember to evaluate your HVAC system’s capacity to ensure it can handle the increased static pressure from higher-efficiency filters while maintaining required air exchange rates.

Let's get a bit technical for a moment, because this is important. We're dealing with something called PM2.5 particles – they're 30 times smaller than a human hair. These tiny troublemakers can float around forever and dive deep into your lungs.

A MERV 13 filter is like having a really good bouncer at your home's door:

  • It stops 85% of the medium-sized particles
  • Catches half of the really tiny ones
  • Overall, it blocks about 75-80% of those pesky PM2.5 particles

Compare that to a MERV 8 filter, which is basically just checking IDs at the door and letting everyone in anyway.

When Good Isn't Good Enough

Here's the thing though – sometimes even a MERV 13 filter isn't enough. During heavy wildfire seasons, we're seeing particle concentrations of 300-500 micrograms per cubic meter. Even after blocking 80% of that, you're still above what the EPA considers safe.

So what can you do? Smart facility managers are taking one of two routes:

  • Upgrading to even better filters
  • Adding separate air purification systems

The Bottom Line

Your home should be your safe haven, especially during wildfire season. While we can't control what's happening outside, we can definitely take steps to keep our indoor air clean and healthy.

Start with a good MERV 13 filter, keep an eye on your local air quality index (check airnow.gov for daily updates), and consider additional air purification if you're in a heavily affected area.

Remember, when it comes to air quality, what you can't see can definitely hurt you. But with the right setup, you can breathe easier knowing you're protected.