If you are using Python 2, it could be blowing up for this reason:

SyntaxError: Non-ASCII character '\xc2' in file ./foo.py on line 13, but no 
encoding declared; see http://python.org/dev/peps/pep-0263/ for details

Try adding the following line to the top of the file:

# coding: utf-8

> On Jan 18, 2020, at 10:04 AM, Paul McGeorge <[email protected]> wrote:
> 
> 
> I recently purchased an ECOWITT GW1000 along with an Ambient WS-2000, using 
> Matts Interceptor driver I have gotten everything working including the Air 
> quality Sensor.  I added the pm2_5 to the database schema and have the data 
> archiving.  
> 
> My next step was to add a Group and Data label for the data.  I tried the 
> code below but the last line causes weewx to fail on startup, the issue seems 
> to be the chararters for micro (µ) and the superscript (³).  I feel like 
> there must be a way to escape these characters and get them to work but I 
> can't figure out this last step...  I was able to get it working by just 
> using ug/m3, but i'd really like to see the µg/m³ instead.  Any ideas?
> 
> import weewx.units
> weewx.units.obs_group_dict['pm2_5'] = 'group_concentration'
> 
> weewx.units.MetricUnits['group_concentration'] = 'microgram_per_meter_cubed'
> weewx.units.MetricWXUnits['group_concentration'] = 'microgram_per_meter_cubed'
> weewx.units.USUnits['group_concentration'] = 'microgram_per_meter_cubed'
> 
> weewx.units.default_unit_format_dict['microgram_per_meter_cubed'] = '%.3f'
> weewx.units.default_unit_label_dict['microgram_per_meter_cubed'] = ' µg/m³'
> 
> Paul
> 
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