Hong Kong’s car pollution sensors help clean the air using infrared and UV beams to track tailpipe exhausts of passing vehicles

Alice Klein at New Scientist reports Hong Kong has improved its air quality by using roadside sensors to detect vehicles with the dirtiest fumes and forcing owners to get them fixed.Vehicles that run on petrol and diesel emit harmful chemicals like carbon monoxide, nitrogen oxides and hydrocarbons. New cars have technology for reducing these emissions,…