unpolluted [Adjective] + atmosphere [Noun]

Strength Strength Dispersion
A:
5
CHISQ:
1,090.5
AWT:
22,353,573
TTEST:
2.23
G2:
55.21
FAWT:
2.43
MI:
7.78
LOGLOG:
18.07
JD:
0.48
MI3:
12.43
DICE:
0.21
RANGE: