Key Features:

Total Volatile Organic Compound (TVOC) sensing from 0 to 1,187 parts per billion
eCO2 sensing from 400 to 8,192 parts per million
Five Operating Modes
Integrated MCU
Onboard Processing
Standard I2C Digital Interface
Optimized Low-Power Modes
Optional NTC Thermistor Pins

Relevant Resources:
Schematic
Eagle Files
Hookup Guide
Air Quality Measurements How-To
Programming and Interfacing Guide(CCS811)
Datasheet(CCS811)
Arduino Library
GitHub