people have worried about smog for many years,and the government has spent billions of dollars to try to clean up the air of big cities.But now we find that there is no escape from unhealthy air. recent studies have show that air inside many homes, office buildings, and schools is full of pollutants; chemicals, mold, bacteria, smoke, and gases. these pollutants are causing a group of unpleasant and dangerous symptoms that experts call "sick-building syndrome." first discovered in 1982, sick-building syndrome most often includes symptoms similar to those of the flu (watering eyes, headaches, and so on) and respiratory infections such as tonsillitis, bronchitis, and pneumonia.