M2A: Working with UNC Institute for the Environment CMAS Center, implement environmental exposure models on national scale, ~50 exposure measures

[KCB13]

Refer to issues: #3, #5, #6, #7, #8, #9, #10, #11, #12, #19, #20, #25, #55, #61, #67, #78

[karafecho]

Refer to issue #61