Air quality/pollution sensors

[wdq]

I'd like to add air quality/pollution sensors to the board since they are part of the wunderground API.

Probably won't get around to this until I'm out of school at the end of this year, or in the summer of 2018.

Ideally the sensors would go into the same solar radiation shield that the temperature/humidity/pressure sensors are in, and also use I2C. I'd be designing a new board that goes into there.

Possible fields:

AqNO - [ NO (nitric oxide) ppb ]
AqNO2T - (nitrogen dioxide), true measure ppb
AqNO2 - NO2 computed, NOx-NO ppb
AqNO2Y - NO2 computed, NOy-NO ppb
AqNOX - NOx (nitrogen oxides) - ppb
AqNOY - NOy (total reactive nitrogen) - ppb
AqNO3 -NO3 ion (nitrate, not adjusted for ammonium ion) UG/M3
AqSO4 -SO4 ion (sulfate, not adjusted for ammonium ion) UG/M3
AqSO2 -(sulfur dioxide), conventional ppb
AqSO2T -trace levels ppb
AqCO -CO (carbon monoxide), conventional ppm
AqCOT -CO trace levels ppb
AqEC -EC (elemental carbon) – PM2.5 UG/M3
AqOC -OC (organic carbon, not adjusted for oxygen and hydrogen) – PM2.5 UG/M3
AqBC -BC (black carbon at 880 nm) UG/M3
AqUV-AETH -UV-AETH (second channel of Aethalometer at 370 nm) UG/M3
AqPM2.5 - PM2.5 mass - UG/M3
AqPM10 - PM10 mass - PM10 mass
AqOZONE - Ozone - ppb