OK, so the weewx-purple is doing the maths which is all well and good
but not immediately obvious since most AQI displays have a nice button
with good, moderate,bad etc. like Ian's Weather34 display.
Each to their own I suppose :)
cheers
Tim
On 23/9/20 10:44 am, John Kline wrote:
Hi Tim,
You do not need a separate database to store AQI. It can be derived
with xtypes. And AQI can be and is plotted. That is what
weewx-purple is doing for US EPA AQI. It’s also using xtypes to
compute LRAPA PM2.5 values and UNBC PM2.5 values.
On Sep 22, 2020, at 4:27 PM, Tim Tuck <[email protected]> wrote:
Hi Daniel,
All cool but you are plotting PM not AQI .
AQI is a value calculated from either a single PM type or multiple
PM types.
https://aqicn.org/calculator
https://en.wikipedia.org/wiki/Air_quality_index
The AQI plugin is supposed to do that and it creates a new db to save
the AQI values in it.
I have an Ecowitt PM2.5 monitor and that data is being saved to the
weewx db, I'm investigating how I can calculate AQI from that data
using the AQI plugin and then show the actual AQI via the Belchertown
skin.
I've just been wondering if anyone else has done that, and if so, how ?
If not one has done that yet, I'll plod on and eventually work it out :)
cheers
Tim
On 23/9/20 2:06 am, Daniel Rich wrote:
I have it working with my PurpleAir and the weewx-purple extension.
All I had to do was add pm2_5 to my sensor list and create a graph:
station_observations = barometer, dewpoint, outHumidity,
rainWithRainRate, pm2_5, radiation
And in /etc/weewx/skins/Belchertown/graphs.conf:
[[chart7]]
title = Air Quality
[[[pm2_5]]]
name = AQI PM 2.5
zIndex = 1
color = "#becc00"
[[[pm1_0]]]
name = AQI PM 1.0
zIndex = 1
color = "#ffc83f"
[[[pm10_0]]]
name = AQI PM 10.0
zIndex = 1
color = "#c83fff"
You can see it in action at https://www.lapseofthought.com/weather/
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