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This is Scientific American 60-Second Science. I'm Cynthia Graber. Got a minute?

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Devices that detect potentially hazardous gases or airborne environmental pollutants are out there.

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But they're expensive and bulky.

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Now MIT researchers say they've developed a way to get the same detection abilities with your smartphone.

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The research team modified what are called near-field communication tags, or NFC tags.

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Smartphones with NFC capabilities send out magnetic field pulses.

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Magnetic field creates an electric current on the tag that the phones pick up.

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Such systems are typically used to track products or drugs.

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For the new application, the scientists added links to the circuit made of carbon nanotubes.

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Each link responds to one particular gas, by changing how the nanotubes conducts electricity.

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By sensing the change in electric current on the tag, the smartphone signals that it has detected the gas in question.

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The method was tested with ammonia, cyclohexanone and hydrogen peroxide.

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And the tags could sense the substances at levels of a few parts per million.

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The research is in the Proceedings of the National Academy of Sciences.

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Such inexpensive tiny tags require no external power.

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The scientists say their NFC tag system has the potential to be widely used to monitor gases that can affect health, safety and the environment.

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Thanks for the minute, for Scientific American 60-Second Science. I'm Cynthia Graber.

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