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A microcovid is a unit of risk. One microcovid is a one-in-a-million chance of getting COVID.
An emitter is an average person in your area. A nearby emitter is someone sitting next to you. A distanced emitter is someone keeping 6 feet away from you. This model assumes you are vaccinated and boosted.
For example, suppose you are joining a dinner party with 5 other people in Alameda County, and the number under "nearby emitter" for Alameda is 100. Each hour indoors near 5 people incurs a risk of 500 microcovids. If the party lasts two hours, the model estimates you will receive 1000 microcovids, which is a 0.1% risk of getting COVID from that dinner party.
Risks add up. If you go to ten parties this month and each one has a 0.1% risk, your risk of getting COVID this month will be 1%.