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If you've considered this question and you live in a rich country, you've probably been thinking about whether to ditch your gas stove for an electric or induction cooktop.

The brand-new unit is compact — 226 square feet — but comes furnished with an air conditioner, induction cooktop, refrigerator, laundry machine and plenty of cabinet space.

Instead, carmakers are turning to increasingly novel add-ons from beds to cooktops to boost sluggish sales.

The red-hot national debate over gas stoves is also raging in New Jersey, where Mr. Murphy wants to electrify cooktops and transition away from natural gas.

Researchers sampled the air of California and Colorado homes with gas ovens and cooktops, comparing it to the air in homes with electric ones.