[werk_ag]

For most of us, the purpose of PM2.5 and PM10.0 readings is to calculate the corresponding AQI, which usually is done based on averaging the measurements for 1H, 3H, 12H or 24 hours.
Each picture represents the last 24 hours (not last day).
Both dust sensors are read in sync (max. 1 second difference) at 10 minutes intervals.

Unit 1

   
Data measured with an WeatherDuino - Air Quality Monitor


Unit 2

   
Data measured with an WeatherDuino - Air Quality Monitor


Prepositionally, I am not identifying which sensors each unit uses. One uses Sensirion SPS30 and Sensirion SCD30, and the other PMS7003 and MH-Z19, for dust and CO2 respectively.
I know its hard to discover which one is which one!

Bets accepted!


During the upcoming week, I will try to publish similar pictures for other 24 hours periods.
I'm also preparing on ThingSpeak a live comparison with data from the last 12 hours of readings (PM2.5 & PM10.0, as also CO2).

Data from WeatherDuino - Air Quality Monitor

[werk_ag]

Here it is, a side by side comparison, updated every 15 minutes.

Equipment:
Two WeatherDuino Air Quality Monitor III

Unit 1:
Dust Sensor: Sensirion SPS30
CO2 Sensor: Sensirion SCD30

Unit 2:
Dust Sensor: PMS7003
CO2 Sensor: MH-Z19 (model B)

https://thingspeak.com/channels/317451



Note:

From SCD30 datasheet:

When activated for the first time a period of minimum 7 days is needed so that the algorithm can find its initial parameter set for ASC.

The SCD30 sensor in test hasn't completed this 7 days period yet.

[werk_ag]

Seems there is a problem with the ThingSpeak link on the post above.
It is supposed to be a public channel, but seems it isn't work that way...

Update:

Its a ThingSpeak issue.
Here is their answer:

Thanks for the heads up. We're working on a fix.
Members of the public can actually view the public channel if they first visit https://thingspeak.com before clicking the link to the public channel.

So first click here: https://thingspeak.com

and then to see the public channel, clique here: https://thingspeak.com/channels/317451

[engolling]

I still have on my To-Do-List to install my SPS30 outside right beside my PMS7003.
But I have not found the time yet ... unfortunately.

But I'm very curious what the other comparisons will reveal.

Regards,
Stefan