oops.se
What kind of environmental data are you looking for?
- Temperature
- Humidity
- Pollen
- Dust particle
- Gases of different kinds
- Air pressure
- Movement, tilt, acceleration
And just collecting data, naaaa. What is your goal with collecting data?
And there is a lot of sensors that is easy to start with and that is the digital sensors, that will omit the need for A/D converters and calibration. And look for I2C sensors, quite easy to start with.