Total

First-Tier and Second-Tier Cities

Other Cities

Subjective well-being

3.743

3.738

3.748

(6017)

(2920)

(3097)

City size

0.596

2.222

0.216

(111)

(21)

(90)

Environmental pollution

0.009

0.0151

0.00759

(111)

(21)

(90)