Why PM 2.5?

World Air Quality report focuses on PM2.5 concentrations,

as this is the pollutant widely regarded as most harmful to human health. PM2.5 is defined as ambient airborne particles measuring up to 2.5 microns in size. Its microscopic size allows the particles to enter the blood stream via the respiratory system and travel throughout the body, causing far-reaching health effects, including asthma, lung cancer and heart disease. Air pollution has also been associated with low birth weight, increased acute respiratory infections and stroke.

Worldwide ambient air pollution accounts for:

  • 29% of all deaths and disease from lung cancer

  • 17% of all deaths and disease from acute lower respiratory infection

  • 24% of all deaths from stroke

  • 25% of all deaths and disease from ischemic heart disease

  • 43% of all deaths and disease from chronic obstructive pulmonary disease

High-precision Sharp dust sensor

It uses a Sharp dust sensor (Part No. GP2Y10226AU0F) and uses the optical scattering principle to detect changes in concentration of 2.5 μm-sized particles in the air.

Infrared light emitting diodes and photoelectric sensors are built in, and the light rays from the light emitting diodes are reflected as they pass through the particles. Photoelectric sensors detect the intensity of reflected light and indicate the concentration of particles in the air.

The measured concentration of dust particles in the air is converted into a numerical value and displayed as a three-digit number on the LED display, and the three LED colors help the user to check the air quality.




* JW-3200 is using a Sharp Dust Sensor(model. GP2Y1026AU0F) and Dust number is measured
by using a digital dust indicator P-5L2 which is made by SIBATA SCIENTIFIC TECHNOLOGY LTD.