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530
22
550
Alaska
22
Alert
22
Arctic
22
Barrow
22
Canada
22
Ellesmere Island
22
Greenland
22
Ny-Alesund
22
Queen Elizabeth Islands
Spitsbergen
22
Svalbard
22
Svalbard and Jan Mayen
22
United States
22
annual variation
22
filter
22
ground-based measurement
ice
22
nucleation
22
particulate matter
22
Nunavut
21
concentration (composition)
21
concentration composition
1
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