When Hurricane Maria struck Puerto Rico on September 20, 2017, the storm devastated the island's electrical grid, leaving many people without power for months.

This lack of electricity, as well as other storm-related damage, prevented air-quality monitoring in many areas.

Now researchers have shown that low-cost sensors that run on solar energy can be used to monitor air pollution after a disaster.

They report their results in ACS Earth and Space Chemistry.

Three months after Hurricane Maria, half of Puerto Rico still lacked electricity, while the other half experienced frequent power outages.

As a result, backup generators that ran on gasoline or diesel were widely used, potentially increasing air pollution.

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