Its my birthday today - and look what just arrived 
Thank-you @zach for making it happen - and thanks @mohit for designing the shield.
Phew - Im glad we got it made before you guys get bought by microsoft and are too busy drinking bollinger on your yacht to remember us 
Grove dust sensor
MICS-5525 (MICS-5524) Carbon Monoxide / Hydrocarbons / VOCs
Figaro TGS2602 Hydrogen Sulfide (Sewer gas)
HXD Buzzer
MQ2 (MQ131) Ozone
MQ1 (MQ138) Formaldehyde
DHT22 Temperature / Humidity