Cars are polluting less — but for how long?

Cars are getting more efficient and less polluting, resulting in better air quality for everyone, according to a new report from the Environmental Protection Agency. But with a new administration coming in that has made climate change and air pollution less of a priority — and drilling for more fossil fuels more of one — it’s unclear how sustainable this trend will be.

In the US, new model cars are traveling further on less gas, the EPA reports.