Omni Calculator

The Omni Calculator Project offers free calculators to help people solve all sorts of problems, from figuring out how much plastic waste they're generating to deciphering how much money to expect from the child tax credit. Now, the CO2 Breathing Emissions Calculator, created by civil engineer Kenneth Alambra and PhD physics student Dominik Czernia, aims to help people better understand the indoor air quality of all sorts of spaces. To use the calculator, you specify the type of room you're trying to analyze-for example, a basement, conference room, theater, or bar-along with how many people are inside, whether it was empty or not before you entered, if is occupants are resting or doing strenuous work, how long you're in that room, and the room's dimensions. The calculator then gives you the CO2 concentration as both a percentage of the air and in parts per million (PPM). "There are data available online on how much CO2 do we exhale in one breath depending on the level of activity: resting, working, exercising, etc.