Aerosol particles 2

Concentration
Typical: 10-50µg/m³ (PM10)
Gothenburg: at 14:00 today
               PM10                10.3µg/m³
               PM2.5                4.2 µg/m³
               Last monday:
               PM10                 140µg/m³ at Gårda
Limits (EU regulations)
Annual average value PM10 40µg/m³
Diurnal (24h) average value PM10 50µg/m³ (90 percentile)
Health effects
The main questions:
  • That property of the particle cause health effects?
    • total mass? ← Focus in the beginning
    • size of particles? ← Most focus today
    • composition of particles?
Studies:
  • epidemiologically (look at different groups of people with different exposure)
  • cell studies
PM10 respiratory fraction of aersol particle (bigger particles simply can't enter the lungs because they are too big.)
Health issues discussed are usually the ones where the particles reach the alveole
Filters to remove particles
Diesel procuces more particles than petrol
We know how to collect the particles, but the problem is removing them.

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