Particle pollution, if they are using it correctly, which I think they are, includes exhaust and pretty much every post-production pollutant produced by a car (

Particle pollution, if they are using it correctly, which I think they are, includes exhaust and pretty much every post-production pollutant produced by a car (before it is scrapped I guess). See: https://www.epa.gov/pmcourse/what-particle-pollution https://www.epa.gov/pmcourse/what-particle-pollution