للأرض وجود إنساني لأنها تمتلك ما لا تمتلكه الكواكب الأخرى. لديها جو مناسب, لديها الهواء. This makes it suitable for human and many other living organisms. We have been taking these free gifts of nature for granted. We have contributed a lot in degrading the quality of air around us. لكن, in modern days, monitoring of air has found its place in the list of important things to do. Both ambient and open air should be monitored in an important basis.