This is a prospective, non-randomized, controlled, interventional study aiming to assess, in a primary school in the city of Palermo, the health effects of a maintenance and care intervention of the school's green areas.

All children of the third, fourth and fifth classes of two school complexes of the same primary school will be selected. One complex will undergo maintenance and care of the green areas and gardens inside the school. The other complex will serve as a control group and will not undergo any intervention.

The study will involve three phases.

1. During the first phase (prior to the intervention) respiratory and allergic symptoms will be assessed through a standardized questionnaire to be administered to students, parents and teachers in both the school complexes.
2. During the second phase, the maintenance and care intervention plan will be implemented in the experimental complex.
3. During the third phase, 1 week after the maintenance intervention, respiratory and allergic symptoms will be re-assessed through a standardized questionnaire to be administered to the same students, parents and teachers in both the school complexes.

Inclusion Criteria:

• male or female gender
• age between 7 and 11 years

Exclusion Criteria:

• no exclusion criteria