‘Non-Tailpipe’ Vehicle Air Pollution Risks May Be Future Regulatory Focus

As the national vehicle fleet transitions toward electric vehicles (EVs) and conventional vehicles become cleaner and more efficient, emissions of fine particulate matter (PM2.5) from non-combustion sources, such as brakes and tires, will become a relatively more importance source of health risks and focus for regulators, air quality experts say. Traditionally, air regulators have sought to reduce pollutants emitted by vehicle tailpipes, such as PM2.5, nitrogen oxides (NOx), carbon monoxide and others. Some pollutants are directly emitted, while others form...