More particulate matter from sulphur dioxide, nitrogen oxides and ammonia than previously assumed

Emissions of sulphur dioxide, nitrogen oxides and ammonia are mainly from anthropogenic origin: traffic, energy production and agriculture. It was found that contributions to particulate matter from the conversion of these atmospheric compounds appear 50 per cent larger than were measured and calculated in the past. Consequently, the currently policy measures could be more effective to lower particulate matter levels than was initially projected.