The auto industry has pushed this metric for decades. But cars—especially EVs—are so fast that comparing the decimals is pointless and dangerous.

Autonomous vehicle companies — which could be permitted to operate in the District this fall — enjoy a blanket exemption from public records law.

A sharp turn toward cooler weather means summer is over in DC, just as autumn officially arrives.

Data on current carbon emissions will help cities meet goals set at Paris climate summit, and show people how they contribute to global warming.