When we use things like cars, factories, and machines that burn fuel or use electricity, they release things called emissions. These emissions can be bad for the environment and the air we breathe.
To help keep the environment clean and healthy, people make rules called regulations that tell companies and factories how much they are allowed to release. One of these rules is the lowest achievable emissions rate.
This rule means that companies and factories have to work really hard to make sure they release as little emissions as possible. They have to use special technology and equipment to clean the emissions before they let them into the air.
So, when we talk about the lowest achievable emissions rate, it means companies and factories are doing everything they can to make sure they release the smallest amount of emissions possible to help keep our air clean and healthy.