The Shinyei experiment
Real-time Air Quality readings from Beijing

Compartir: aqicn.org/sensor/shinyei/es/
For a complete list of all the Air Quality Sensors test on the World Air Quality Index project, check our sensor overview page.

Introduction

For more information about those real-time dylos and BAM monitor PM2.5 and PM10 readings, please refer to our article on the Dylos Air Particule Counter experimentation.


If you want to know about other affordarable Air Quality Sensors such as Shinyei and Samyoung, check our sensor overview page.

Are cheap low-cost air quality sensor really worth?

There are many affordable and low-cost air particule sensor. The most famous one is definitely the Japanese Shinyei sensor, with a cost of around 75 CNY (12 USD), and it's Korean copy, the Samyoung sensor, with a cost of around 35 CNY (5.5 USD).

This objective of this experiement is to provide empiral data about the quality of those sensor, e.g. can they be used to acurately measure Air Quality, especially for outdoor data and polluted countries.

There are many research papers on this topic. The one most up-to-date at the time of writing is from David Holstius. Check it online here: field calibrations of a low cost aerosol sensor ( research paper).

Inside the low-cost sensor

Compared to the Dylos monitor, one could say that low-cost sensors are more like measuring the air opacity rather than individual particles:

The Dylos monitor works by counting individual particles, and classifying them by size (smaller than 0.5 and smaller than 2.5). By doing so, it is able to provide accurate values about the exact amount of dust particles in the air. And by knowing the typical "dust" type that is being measured, is it somewhat straight forward to deduct the total mass of particles.

The low-cost sensor, on the contrary, are not counting individual particles, but instead, counting the amount of time particles are detected by the photo diode sensor. The graph below represents how the Shinyei is "calculating" the air quality: First, it applies a pass band filter to remove very small particles or noise, which is represented by the red line. Then, independently of the intensity (or particle size), it counts the amount of time any particle is seen. This amount of time, also called "Low Pulse Occupancy" (LPO), can be considered as the "opacity percentage" of the air circulating through the sensor. In order to measure the LPO for different particles sizes, the sensor provide a variable input which allows to adjust the pass-band filter.

Shinyei PPD42NS raw diode reading
Shinyei PPD42NS raw diode reading (in volts)

Shinyei PPD42NS raw LPO reading
Shinyei PPD42NS raw LPO reading (in occupancy)

Configuración del experimento


The low-cost particule counters used is this experiment are based on: The reference air quality meters are:
For the source code and hardware connectivity information, please refer to this page: aqicn.org/api/shinyei/.

Note (December 18th 2014): Due to a wrong setup, the data is from the Samyoung is currently not available - it will added again later. Also, this experiment has been updated to use both Shinyei output, which are supposed to be able to reflect small and large particles.

Datos en tiempo real

Current Dylos readings are: Particules larger than 2.5 is -, larger than 0.5 is -, updated on - - (China time).

Current Shinyei readings are: LPO for particules larger than 1 is -, LPO for 2.5 is -, updated on - - (China time).

Time series graphs

From the previous graph (Shinyei vs. Samyoung), it is clear that the data generated by the Samyoung sensor is not at all reflecting actual air quality. In order to ensure that this issue is not caused by a deficient sensor, the sensor was replaced with a new one, but yet, no improvement were observed. For this reason, the Samyoung data will not be represented in the next plots. It is however interresting to notice that other resarch papers, such as the low-cost coarse airborne particulate matter sensing for indoor occupancy detection study (online ref) shows much better results for the Samyoung sensor, so this this something to be further investigated.

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Shinyei:
PM2.5 based Air quality data:
PM10 based Air quality data:

Initial findings

At first glance, the correlation for the Shinyei sensor seems to be much stronger from PM10 than PM2.5 readings. But, actually, it seems to be even more complicated since during some periods, the correlation to PM10 seems higher while for other periods, correlation to PM2.5 is higher. If this turns out to be true (which will require more data for the confirmation), that would mean that calculating the AQI from a Shinyei sensor could prove to be very arbitratary (see the PM10 vs. PM2.5 analysis).


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For the list of all air quality sensors, check the Sensor Overview page

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Acerca de la calidad del aire y la medición de la contaminación:

Acerca de los niveles de calidad del aire

ICACalidad del AireProteja su Salud
0 - 50 Buena No se anticipan impactos a la salud cuando la calidad del aire se encuentra en este intervalo.
51 -100 Moderada Las personas extraordinariamente sensitivas deben considerar limitación de los esfuerzos físicos excesivos y prolongados al aire libre.
101-150 Dañina a la Salud de los Grupos Sensitivos Los niños y adultos activos, y personas con enfermedades respiratorias tales como el asma, deben evitar los esfuerzos físicos excesivos y prolongados al aire libre.
151-200 Dañina a la Salud Los niños y adultos activos, y personas con enfermedades respiratorias tales como el asma, deben evitar los esfuerzos excesivos prolongados al aire libre; las demás personas, especialmente los niños, deben limitar los esfuerzos físicos excesivos y prolongados al aire libre.
201-300 Muy Dañina a la Salud Los niños y adultos activos, y personas con enfermedades respiratorias tales como el asma, deben evitar todos los esfuerzos excesivos al aire libre; las demás personas, especialmente los niños, deben limitar los esfuerzos físicos excesivos al aire libre.
300+ Arriesgado

Para saber más sobre la calidad del aire y la contaminación, comprobar la tema Calidad wikipedia Air o Guía airnow a la calidad del aire y su salud .

Para obtener consejos de salud muy útiles de Beijing doctor Richard Saint Cyr MD, compruebe www.myhealthbeijing.com blog.


Aviso de uso: Todos los datos de Calidad del aire no están validados en el momento de la publicación, y debido a la garantía de calidad, estos datos pueden modificarse, sin previo aviso, en cualquier momento. El proyecto World Air Quality Index ha ejercido todas las habilidades y cuidados razonables para compilar el contenido de esta información y en ningún caso el World Air Quality Index o el equipo del proyecto será responsable en el contrato, agravio o de otra manera por cualquier pérdida, lesión o daño que surja directa o indirectamente del suministro de esta información.



Configuración


Configuración de idioma:


Temperature unit:
Celcius