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Table 1 Proportion of fine and coarse fraction of the collected PM estimated for each city and each season. The proportion is expressed as mass of the fine fraction in percent of the total mass (coarse + fine fraction) collected by high-volume cascade impactors in each sampling period.

From: Cytokine release from alveolar macrophages exposed to ambient particulate matter: Heterogeneity in relation to size, city and season

  Spring (percent fine of total) Summer (percent fine of total) Winter (percent fine of total)
Lodz 58 54 77
Rome 53 52 68
Oslo 42 60 51
Amsterdam 55 60 56