Every day we are exposed to hundreds of toxic chemicals such as solvents, petrochemicals, toxic metals, pesticides and more. Smog is a type of large-scale outdoor pollution. It is caused by chemical reactions between pollutants derived from different sources, primarily automobile exhaust and industrial emissions. Cities are often centers of these types of activities, and many suffer from the effects of smog, especially during the warm months of the year. Many people spend large portion of time indoors – as much as 80-90% of their lives. We work, study, eat, drink and sleep in enclosed environments where air circulation may be restricted. For these reasons, some experts feel that more people suffer from the effects of indoor air pollution than outdoor pollution. Poor indoor air quality can lead to discomfort, ill health, and, in the workplace, absenteeism and lower productivity. Serious health impacts resulting from poor indoor air quality, lung cancer from radon exposure, and carbon monoxide (CO) poisoning. There are many sources of indoor air pollutants and among the common ones are environmental tobacco smoke (ETS) emitted due to burning of tobacco products; various chemical substances such as formaldehyde emitted from furnishings; volatile organic compounds emitted from the use and application of solvents; and ozone emitted from photocopiers and laser printers. More widespread health impacts include increase allergy and asthma from exposure to indoor pollutants (particularly those associated with building dampness and mold), colds and others infectious disease that are transmitted through the air, and “sick building syndrome” symptoms due to elevated indoor pollutant levels well as other indoor environmental conditions. These more widespread impacts have the potential to affects large numbers of building occupant and are associated with significant cost due to health-care expenses, sick leave and lost productivity.