How does Canadian wildfire smoke affect indoor air quality in Ohio?
Canadian wildfire smoke raises fine particulate matter (PM2.5) that infiltrates buildings through HVAC intake, doors, and windows. Ohio EPA issued a statewide Air Quality Advisory on July 15, 2026, warning the Air Quality Index could reach the Unhealthy range statewide. That advisory covers outdoor conditions — smoke doesn’t stop at the property line.
Regional air officials separately monitored the Miami Valley — Clark, Darke, Greene, Miami, Montgomery, Preble, and Shelby counties — at Unhealthy for Sensitive Groups during the same event, and AirNow’s system alerts confirm wildfire smoke is still affecting multiple states this week.
Why does closing windows and doors during a smoke event create a different indoor air problem?
Sealing a building tighter reduces smoke infiltration, but it also cuts fresh air exchange. EPA’s guidance on wildfires and indoor air quality recommends a sealed “clean room” during smoke events for exactly this reason — reduced ventilation changes indoor air dynamics.
Buildings that stay sealed for extended periods can see a buildup of airborne bacteria, mold, and other microbes that regular ventilation would normally dilute.
What can a facility do about indoor air quality when outdoor air quality is out of its control?
Outdoor conditions during a regional smoke event are outside any single facility’s control. Indoor air quality is a separate, controllable variable that depends on how a building’s air and surfaces are actively treated on an ongoing basis — not filtered once and forgotten.
How is EMT’s approach different from standard air filtration?
Standard filtration only captures particles that physically pass through a filter — it doesn’t treat what’s already circulating in a room. EMT’s Energized Hydrogen Peroxide technology actively targets viruses, bacteria, and mold in the air and on surfaces throughout a space, including areas HVAC systems reach that filters don’t directly treat.
It runs continuously rather than only when air happens to pass through a filter point. According to EMT’s published test results, it works roughly 13 times faster than other oxidizing methods.
Is EMT’s purification technology chemical-free?
Yes — EMT systems add no chemicals, which makes them suitable for spaces with people, pets, plants, or sensitive products, including healthcare facilities, schools, food processing environments, and occupied commercial, retail, and residential buildings.
How effective is EMT’s technology, and how was it tested?
EMT’s MAK-9 systems were tested in real occupied spaces — a 1,137-cubic-foot office and a 1,146-cubic-foot lab — over a continuous 24-hour period, meeting Environmental Microbiology Laboratory Accreditation Program (EMLAP) requirements, rather than sealed test-chamber conditions.
Reported reductions include up to 99.9% for SARS-CoV-2, 99.47% for H1N1, 98.9% for Penicillium mold, and 99.99% for Listeria and Staphylococcus, depending on the organism and test conditions.
What should Dayton-area businesses and facilities take away from this month’s smoke events?
Regional smoke events show that outdoor air quality is unpredictable and outside any single building’s control. Indoor air quality is not: facilities that maintain continuous, active air and surface purification are better positioned regardless of what’s happening in the sky outside.
Extreme Microbial Technologies (EMT) provides continuous, chemical-free air and surface purification for healthcare, education, hospitality, food safety, retail, office, and residential settings across the Miami Valley. Contact EMT to learn more.
Sources cited above:
- Ohio EPA — Statewide Air Quality Advisory, July 15, 2026
- AirNow — Ohio state AQI and current system alerts
- US EPA — Wildfires and Indoor Air Quality (IAQ)
- EMT — Purification Technology (EMLAP test detail)
- EMT — homepage (pathogen reduction percentages)
- WHIO — Air quality alert continues across Ohio due to wildfire smoke (Miami Valley county-level detail)