A lemon a day a hair / Society form poster

Due to the acidity of acid rain today, it will lead to hair loss if long expose to the rain.
Using a lemon as cloud, people directly feel the cloud “sour”, and it represents the acidity of rain.
A concrete object stimulates the brain into thinking of sour taste thus feel afraid. And asking people to stop the damage to environment, otherwise your hair is saying farewell to you.