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Mitsubishi Electric Develops High-precision Air-quality Sensor for PM2.5
World's first air quality sensor can distinguish PM2.5, pollen and dustTOKYO, February 8, 2016 – Mitsubishi Electric Corporation (TOKYO: 6503) announced today that it hasdeveloped a small, high-precision air-quality sensor, the world first to detect all fine particles measuring nomore than 2.5 micrometers in diameter, called PM2.5, as well as pollen and dust. It also senses the density ofparticles precisely.

Prototype of Mitsubishi Electric’s new air-quality sensor

Scattered light from PM2.5 particles is measured with Mitsubishi Electric’s unique double-sided mirror
design, which collects about 1.8 times more scattered light than conventional single-sided designs. An air
flow controller provides stable airflow. Components were optimally designed to achieve a small form factor
and were carefully aligned to avoid obstructing the airflow and laser beams. Mitsubishi Electric’s original
shape-discrimination algorithm distinguishes between pollen and dust based on the respective differences in
the optical characteristics of their scattered light, resulting in the world’s first sensor capable of detecting all
PM2.5, pollen and dust particles.

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Mirror

Detector
PM2.5

Air flowController

Mirror Detector ScatteredLightLaser
PathLens

Laser

Structure of Air Quality Sensor (vertical cross-sectional view)

The air-quality sensor prototype consists of a laser diode, aspheric lens, light-collecting mirror, photodetector
and airflow controller. The prototype measures 67mm (W) x 49mm (D) x 35mm (H). The minimum size of adetectable particle is just 0.3 micrometer.

PM2.5 has posed a serious problem, causing air pollution and health-related issues in countries such asChina, India and Japan. The trend has raised public concerns and increased the demand for high-precision
air-quality sensors to detect PM2.5. At present, however, high-precision sensors for PM2.5 are large andexpensive, limiting their applications to commercial use only.
PatentsPending patents for the technology announced in this news release number five in Japan and one abroad insix countries.

###About Mitsubishi Electric Corporation
With over 90 years of experience in providing reliable, high-quality products, Mitsubishi Electric
Corporation (TOKYO: 6503) is a recognized world leader in the manufacture, marketing and sales ofelectrical and electronic equipment used in information processing and communications, space development
and satellite communications, consumer electronics, industrial technology, energy, transportation andbuilding equipment. Embracing the spirit of its corporate statement, Changes for the Better, and its
environmental statement, Eco Changes, Mitsubishi Electric endeavors to be a global, leading green company,enriching society with technology. The company recorded consolidated group sales of 4,323.0 billion yen(US$ 36.0 billion*) in the fiscal year ended March 31, 2015. For more information visit:
http://www.MitsubishiElectric.com*At an exchange rate of 120 yen to the US dollar, the rate given by the Tokyo Foreign Exchange Market on
March 31, 2015

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