Legend (Airbase/Particulate_matter_PM10)

Annual Mean (1) ≤ 20 20 - 31 31 - 40 40 - 50 >50 based on daily values (2) ≤ 20 20 - 31 31 - 40 40 - 50 >50 based on hourly values (3) ≤ 20 20 - 31 31 - 40 40 - 50 >50 based on two daily value (4) ≤ 20 20 - 31 31 - 40 40 - 50 >50 based on variable time intervals (5) ≤ 20 20 - 31 31 - 40 40 - 50 >50 based on weekly values (6) ≤ 20 20 - 31 31 - 40 40 - 50 >50 based on daily values (8) ≤ 20 20 - 31 31 - 40 40 - 50 >50 based on hourly values (9) ≤ 20 20 - 31 31 - 40 40 - 50 >50 based on two daily value (10) ≤ 20 20 - 31 31 - 40 40 - 50 >50 based on variable time intervals (11) ≤ 20 20 - 31 31 - 40 40 - 50 >50 based on weekly values (12) ≤ 20 20 - 31 31 - 40 40 - 50 >50 based on daily values (14) ≤ 20 20 - 31 31 - 40 40 - 50 >50 based on hourly values (15) ≤ 20 20 - 31 31 - 40 40 - 50 >50 based on two daily value (16) ≤ 20 20 - 31 31 - 40 40 - 50 >50 based on variable time intervals (17) ≤ 20 20 - 31 31 - 40 40 - 50 >50 based on weekly values (18) ≤ 20 20 - 31 31 - 40 40 - 50 >50 based on daily values (20) ≤ 20 20 - 31 31 - 40 40 - 50 >50 based on hourly values (21) ≤ 20 20 - 31 31 - 40 40 - 50 >50 based on two daily value (22) ≤ 20 20 - 31 31 - 40 40 - 50 >50 based on variable time intervals (23) ≤ 20 20 - 31 31 - 40 40 - 50 >50 based on weekly values (24) ≤ 20 20 - 31 31 - 40 40 - 50 >50 based on daily values (26) ≤ 20 20 - 31 31 - 40 40 - 50 >50 based on hourly values (27) ≤ 20 20 - 31 31 - 40 40 - 50 >50 based on two daily value (28) ≤ 20 20 - 31 31 - 40 40 - 50 >50 based on variable time intervals (29) ≤ 20 20 - 31 31 - 40 40 - 50 >50 based on weekly values (30) ≤ 20 20 - 31 31 - 40 40 - 50 >50 based on daily values (32) ≤20 20 - 40 40 - 50 50 - 75 >75 based on daily values (34) ≤20 20 - 40 40 - 50 50 - 75 >75 based on daily values (36) = 0 0 - 10 10 - 35 35 - 50 >50 Airbase_Stations (37) Background Industrial Traffic Unknown <all other values>