Wow! You are really ‘super-active’ when you are awake… :lol:
Indeed, there are six ug/m3 values (particulate matter) being provided in the JSON data file: 0.3um particles/deciliter, 0.5um particles/deciliter, 1.0um particles/deciliter, 2.5um particles/deciliter, 5.0um particles/deciliter, and 10.0um particles/deciliter.
I am wondering what the difference is between pm10_0_atm_b and pm1_0_atm_b
maybe one is a 10 minute average?
No, the JSON data file from the PurpleAir sensor does not contain average values - the 10 minute, 30 minute, 1 hour, 6 hour, 24 hour, and one week average values are only available from a JSON data file that can be downloaded from the ThingSpeak (cloud) storage.
The value mostly used is the PM2.5 - although two other values should also be considered important, PM1.0 and PM10.
In the JSON data file, the important value is the one found after the tag ‘pm2_5_atm’ - but I just wrote above, the values found after the tags ‘pm1_0_atm’ and ‘pm10_0_atm’ sould also be considered important.
Note: The values you see in the JSON data file are only for the PurpleAir sensor channel #1 - I do not think the values the PurpleAir sensor channel #2 are available using the aforementioned URL ‘http://192.168.200.145/json’ (lately, I have not been able to get any information, any technical support from the designer/reseller of the PurpleAir sensor).
Brian, where did you get the following information:
PurpleAir sensors use a fan to draw air past a laser, causing reflections from any particles in the air.
To my knowledge (and my ears), I knew that there was a small fan inside the PurpleAir PA-II sensor installed at my home but I could not find that information (about the fan) on the PurPleAir web site.
so I think the first 3 numbers are the important ones
i.e to get PM1, 2.5 and 10
PM must stand for particle measure
and atm might stand for total mass ?
Indeed, as mentioned above, the important values are PM2.5, PM1.0 and PM10. The PM usually stands for 'particulate matter' - unfortunately, I am not too sure for the 'atm' but it could easily mean 'at the moment' such as 'in-near-real-time'... :?
PM2.5 is the particulate value the sites here use for AQI.
...
yup, that just dawned on me too (2.5 micron)
Indeed, you are both right, it is 2.5