How much you know the Indoor Purification
If ordinary people do not eat, can survive for 3 weeks. If no water can survive for 3 days, but if no air, even 3 minutes can not live, we can choose food and water, but it is difficult to choose the air and the respiratory system of the human immune system is much worse than the gastrointestinal tract, so respiratory health is very important for everyone. Air pollution shows a significant upward trend. Many years ago, stay in the house...