Passenger Illness Down 30% How a Northern Bus Company Uses Airofog U260 ULV at Every Turnaround

What No Bus Operator Wants in Their Reviews

A Bangkok–Chiang Rai bus operator runs eight services a day, 220 seats per trip, with both tourists and Thai passengers heading home. In November 2025 a string of reviews appeared on Facebook and Pantip: "Got sick after the trip," "Coughed the whole way," "The toilet smelled." Fourteen one-stars in two weeks.

Khun Yut, head of the main depot, traced the issue: a closed cabin, 50 people for 10 hours, no between-trip disinfection, and air filters changed only monthly.

A Bus Cabin Is a Transmission Microcosm

A 220-seat tour bus, closed windows, central air, 10 hours of travel — perfect conditions for Coronavirus, Influenza, RSV, and Norovirus to spread.

High-touch surfaces: armrests, window switches, call buttons, toilets, luggage racks, stair rails — accumulating pathogens from 50–100 passengers a day.

The Department of Land Transport recommends post-trip disinfection plus weekly deep cleaning to maintain Travel Quality standards.

Damage to the Operator

1. 14 negative reviews → online bookings down 22%.
2. Tour groups decline.
3. Travel Quality standing at risk.
4. Sick passengers may report to provincial health.
5. Low-cost airlines steal market share.

Why Wipe-and-Clean Is Not Enough

Hand wiping seats: 30 minutes per bus, misses the HVAC system.

Aerosol spray: surface only, no airborne kill.

Onboard air purifiers: reduce in-trip load but cannot reset between trips.

The depot needed U260 fogging Chemgene HLD4H at every turnaround — 5 minutes per bus, air and surfaces together, with no lingering odour for the next departure.

U260 — the Depot's New Default

Khun Yut ordered Airofog U260 and 5 L of Chemgene HLD4H. WHD delivered and trained the team in a single morning.

New protocol: 1) Bus arrives. 2) Cleaners wipe seats and floors 15 minutes. 3) U260 fogs the 30 m² cabin in 5 minutes. 4) Doors closed 30 minutes. 5) Ventilate. 6) Ready for the next departure.

Sixty days later: cold/cough/upset-stomach complaints down 70%, 38 new positive reviews, online bookings 110% of baseline, all 24 buses equipped.

Why ULV Fits a Bus Cabin

The HVAC system recirculates air; U260's 5–50 micron mist is drawn into ducts, coil, and filter — disinfecting the system as well as the cabin.

Chemgene HLD4H is EN 14476 certified against Coronavirus, Influenza, and RSV in 1–5 minutes, with no residual odour for the next trip.

10 Reasons Transport Operators Choose Airofog U260

1. 5 minutes per bus.
2. Covers cabin + HVAC.
3. Passengers re-board in 30 minutes.
4. Buses, vans, ambulances, trains.
5. EN 14476 / WHO compliant.
6. Cheaper than outside crews.
7. Done in your own depot.
8. No lingering odour.
9. 1-year warranty, parts in Thailand.
10. WHD — 065-556-6294, LINE @whd268.

Before vs After — Bus Operator

Before: 14 one-stars in two weeks, bookings down 22%, Travel Quality at risk.

After (60 days): Complaints down 70%, 38 positive reviews, bookings 110%, fleet-wide adoption.

Khun Yut — Depot Manager

"Our cleaners learned the U260 in 30 minutes. Every bus leaving the depot is now disinfected. Passengers can feel it, and our reviews are back."

— Khun Yut, depot manager, northern bus company

Make Every Trip Clean — Today

See specs and price: click here

Call: 065-556-6294 | LINE: @whd268

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• Thai Department of Land Transport