The next time you check into your hotel room, don’t just look for the thermostat or the coffee maker.

Look up, to the ceiling.

Make sure there’s a smoke detector, a heat sensor, and one more thing: an air quality sensor. It’s the latest addition to many hotel rooms, and it’s not about safety, but to detect cigarette and vape smoke. And that could result in a hefty fine if you’re caught violating the rules.

But if you check into a room and it has an overwhelming disinfectant odor, chances are the previous guest violated the rules. That air quality sensor might think you are now smoking.

Ask for another room.