Carbon
in Context

Your birthday PPM

The air
when you arrived.

Pick a date since 1900. We’ll use the best available daily measurement, monthly mean or historical estimate—then mark where you sit in the modern curve and 800,000-year record.

Your atmosphere

Choose a date

Type the year and day, choose the month, then tap Show my PPM.

Your result changes when you confirm the date.

Your date stays in this browser. Sharing the link reveals it.

Reading the atmosphere…

The long view

Your place in the atmosphere

Sources: NOAA GML Mauna Loa record ↗ and NOAA/NCEI revised 800,000-year Antarctic ice-core composite ↗. Ice-core values are estimates with age and measurement uncertainty. In this view, the horizontal axis uses a consistent calendar-year scale.