Spotlight: Monitoring Carbon Dioxide Measurements During a Solar Eclipse

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</li> </ul> </div> </nav> </header>  </div> <div class="grid-container"> <div data-drupal-messages-fallback class="hidden"></div> </div> <div id="block-nist-www-content" class="nist-block"> <section class="nist-page__content usa-section clearfix"> <a id="main-content" tabindex="-1"></a> <div class="grid-container margin-top-4"> <div class="nist-page__region nist-page__region--content-top"> <div class="nist-block"> <div> <a class="usa-button usa-button--accent-cool" href="/web/20240707095150/https://www.nist.gov/news-events/news-updates/search">UPDATES</a> </div> </div> <div class="nist-block"> <h1 class="nist-page__title">Spotlight: Monitoring Carbon Dioxide Measurements During a Solar Eclipse</h1> </div> <div class="nist-block"> <div class="font-heading-md"><time datetime="2024-04-22T12:00:00Z">April 22, 2024</time> </div> </div> <div class="nist-block">  <div data-elastic-exclude class="nist-block nist-social__wrapper"> <h2 class="nist-social__title">Share</h2> <div 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<div class="margin-left-4 margin-bottom-2 align-right"> <figure class="nist-image--lightbox nist-image" data-lightbox="https://www.nist.gov/sites/default/files/styles/2800_x_2800_limit/public/images/2024/05/02/low_cost_sensors.jpg?itok=01Q8ARLU" data-media-id="707231"> <img src="/web/20240707095150im_/https://www.nist.gov/sites/default/files/styles/480_x_480_limit/public/images/2024/05/02/low_cost_sensors.jpg?itok=h9Ez4gWX" width="360" height="480" alt="An open gray box filled with circuitry, wires, sensors and a single-board computer sits outside on a lawn." loading="lazy" typeof="foaf:Image"/> <figcaption class="nist-image__caption"> <div data-caption-editable="true" class="nist-image__caption-content"> </div> <div class="nist-image__credit"> <span class="nist-image__credit-label">Credit:</span> A. Boss/NIST </div> </figcaption> </figure> </div> <p>Depending on where you were during the solar eclipse, you may have been able to witness something that only happens every so often. At our Gaithersburg, Maryland, campus, a few NIST researchers watched the solar event with science on their minds.</p><p>During the day, plants undergo photosynthesis, during which they absorb sunlight and carbon dioxide, or CO<sub>2</sub>, to create food and energy, lowering CO<sub>2</sub> concentrations in the local atmosphere. Researchers were curious as to whether their sensors would detect any changes to the concentration of CO<sub>2</sub> during an eclipse.</p><p>To investigate, they used two different types of sensors.</p><p>Their low-cost sensor platform (shown here) is made up of three commercially available sensors — originally used to measure indoor air quality — and a single-board computer, which serves as the brains of the device. The platform works alongside reference gases with known concentrations and compares its CO<sub>2</sub> measurements against them.</p><p>The second type of sensor can detect CO<sub>2</sub> measurements with a very high precision of 0.1 parts per million.</p><p>Did they notice a difference in CO<sub>2</sub> levels? The simple answer is yes. Researchers ran a brief analysis and found that exactly on the dot at 3:20 PM, which was the height of the solar eclipse in Gaithersburg, the CO<sub>2</sub> concentrations spiked a little bit. 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Spotlight: Monitoring Carbon Dioxide Measurements During a Solar Eclipse | NIST