Cumulative number of ground, tall tower and aircraft Greenhouse Gases (GHG) measurements made at observatories and other network sites distributed across the continental US and globe2022-09-30T00:00:0075Cumulative number of ground, tall tower and aircraft Greenhouse Gases (GHG) measurements made at observatories and other network sites distributed across the continental US and globe2023-09-30T00:00:0075850.88Not MetCumulative number of ground, tall tower and aircraft Greenhouse Gases (GHG) measurements made at observatories and other network sites distributed across the continental US and globe2024-09-30T00:00:00Cumulative number of ground, tall tower and aircraft Greenhouse Gases (GHG) measurements made at observatories and other network sites distributed across the continental US and globe2025-09-30T00:00:00