New graph not graphing

[caphector]

I've been trying to add air quality graphs to my weewx-belchertown install; I feel like I'm missing something. I have a WH45 sensor that reports PM2.5, PM10, and CO2. I've verified data is being logged to the Archive DB under co2, pm2_5, and pm10_0, as well. I think that all I need is in the archive DB so I tried adding charts:

[Air Quality]
        show_button = true
        button_text = Air Quality
        time_length = today
        [[CO2Chart]]
          title = CO2 Levels
          type = line
          [[[co2]]]
        [[DustChart]]
          type = line
            [[[pm2_5]]]
            [[[pm10_0]]]

Unfortunately, this doesn't seem to be graphing anything and I'm not sure why. I added a soil moisture graph using the same syntax, so I know that should be working. Does this need a data binding or other config beyond the graph itself?