unpolluted [Adjective] + atmosphere [Noun]

Strength Strength Dispersion
A:
3
CHISQ:
174.63
AWT:
27,457,660
TTEST:
1.7
G2:
27.17
FAWT:
1.98
MI:
5.91
LOGLOG:
9.37
JD:
0.43
MI3:
9.08
DICE:
0.12
RANGE: