Fig. 2: Daily mean values (± 95% confidence interval) of HI, temperature and relative humidity after the intervention in May.

The left panel displays daytime data (7:00−19:00) for heat index (a), temperature (c) and relative humidity (e), and the right panel shows nighttime data (19:00–7:00) for heat index (b), temperature (d) and relative humidity (f), across all study arms.