I live with 3 dogs and was alone the entire day.

For the interested, here is the graph for a year: https://i.imgur.com/mrXI3y1.png

> However, since the advent of widespread industrialisation, atmospheric CO2 levels have exponentially increased (Fig. 1). In just the last ~ 50 years it has risen from < 340 ppm (in 1980), to > 420 ppm in 2025 (Lan et al., 2025). Atmospheric CO2 is currently increasing at more than 2 ppm each year, largely due to humanity’s activities, such as the burning of fossil fuels (Eggleton, 2012).

There's good reason to believe we're on the cusp of a solar energy revolution and, more generally, ready to turn things around. But even in the worst scenarios I can imagine, outdoor air 50 years from now (as posited in the title) would not be as bad as indoor air now.

Calcium is easy to get from supplements, and phosphorus from food, but don't mess with bicarbonate.

It turned out that my bicarbonate rise was driven by contributions from: potassium citrate (70%), alkaline water (8%), calcium bicarbonate (8%), calcium citrate (2%), and magnesium citrate (2%). I switched to calcium glycinate and magnesium glycinate capsules.

So no, my rise in bicarbonate was not driven by atmospheric CO2, but for a month, I got a taste of what happens even with a mild rise to the upper edge of the normal range.