While not answering your question, I do have a XType extension,
https://github.com/bellrichm/weewx-aqi-xtype, that I think does what you
want. It is not widely adopted, so it is a bit rough around the edges
(feedback is always welcome).
If you do want to try it, I recommend installing the latest pre-release,
https://github.com/bellrichm/weewx-aqi-xtype/releases/tag/v2.0.0-rc02.
rich
On Wednesday, 5 March 2025 at 16:58:47 UTC-5 Andrew McGinnis wrote:
> I'm trying to get a calculated AQI value shown on my index.html page, but
> getting index.html.tmpl right is failing me.
>
> In the .tmpl file, I have at the top:
>
> #def getAQI(C_p)
> #set breakpoints = [
> {'BP_lo': 0.0, 'BP_hi': 12.0, 'I_lo': 0, 'I_hi': 50},
> {'BP_lo': 12.1, 'BP_hi': 35.4, 'I_lo': 51, 'I_hi': 100},
> {'BP_lo': 35.5, 'BP_hi': 55.4, 'I_lo': 101, 'I_hi': 150},
> {'BP_lo': 55.5, 'BP_hi': 150.4, 'I_lo': 151, 'I_hi': 200},
> {'BP_lo': 150.5, 'BP_hi': 250.4, 'I_lo': 201, 'I_hi': 300},
> {'BP_lo': 250.5, 'BP_hi': 350.4, 'I_lo': 301, 'I_hi': 400},
> {'BP_lo': 350.5, 'BP_hi': 500.4, 'I_lo': 401, 'I_hi': 500}
> ]
> #for bp in breakpoints
> #if C_p >= bp.BP_lo and C_p <= bp.BP_hi
> #set aqi = ((bp.I_hi - bp.I_lo) / (bp.BP_hi - bp.BP_lo)) * (C_p -
> bp.BP_lo) + bp.I_lo
> #return int(aqi)
> #end if
> #end for
> #return None ## If PM2.5 is out of range
> #end def
>
>
> and then later in the template file, that function is called to make a
> card with the AQI value shown, as calculated from my $day.pm2_5out.avg
> value:
>
> #if $name == "AQI"
>
> #set aqi = $getAQI($day.pm2_5out.avg)
> <div class="row">
> <div class="col-6">
> <h4 class="h2-responsive">This is the AQI:$aqi</h4>
> <p class="text-muted">
> ## PM2.5: $day.pm2_5out.avg μg/m³
> </p>
> </div>
> </div>
>
> This is not working. Fiddling with it, at best I can get a card to
> generate that shows the title, and the "This is the AQI:" (and the
> pm2_5out.avg when uncommented), but no $aqi value. At worst, '<class
> 'TypeError'>' or '<class 'NameError'>' or '<class 'AttributeError'>'.....
> Best guess is I'm doing the lookup table wrong.
>
> I'm fully expecting that I can do a calculation within a template, based
> on an $observation (a la $growdeg/1.8 to get GDD in degree_C), but some
> combination of syntax, placement/location in the template, or simply
> template limitations are stopping me.
>
> I know there are extensions to do AQI. They seem to pull from external
> data sources (NowCast, etc), and extend the database schema with additional
> observation types. I can probably tweak them to use my recorded PM
> measurements. But I have the base $pm2_5out variable and equation to
> calculate AQI myself, and don't want to record it as an observation- just
> shown for ephemeral display only, in my "Current" page.
>
> Am I way out of line, or can someone nudge me in the right direction?
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