1.yes it is . because The air covers all people on all the earth and if the air is polluted, it will directly affect human health. If the air is dirty, we will feel extremely uncomfortable, especially those with weak health, poor resistance, .. With clean air quality, people living will feel comfortable, health will not Threatened.

2.to protect the environment , we should Cleaning and sanitizing classrooms and housing grounds,Littering the prescribed places

 and we should not Put garbage in the right place,abetting acts harmful to the environment.

@vanngocminh

hoidap247.com

1. yes, it is because lean air provides the amount of oxygen that the body needs
The brain needs a certain amount of oxygen to function. You may not know that Serotonin is a neurotransmitter that makes people feel happier and more comfortable. In order for the body to produce more Serotonin, oxygen is an extremely important component.

2. we should : 

cleaning and sanitizing classrooms and housing grounds
Dispose of garbage in the right place, do not litter indiscriminately.
Limit the use of plastic bags.
Saving electricity and water in daily life.
Actively plant trees.
Actively participate in environmental protection movements.
Do not abet acts harmful to the environment.

and we should not :

Indiscriminate dumping of waste and wastewater
Cutting forests, burning forests to get wood
Use a lot of plastic bags, throw plastic bags indiscriminately

@nam