Have installer unroll and air out carpet in his warehouse for several days before installation. Stay away during installation, especially during the seaming process. Keep off the carpet for several days after installation during high gas-off period. Continuously ventilate house with fresh air using fans. If anyone gets symptoms from the smell, remove the carpet.
Some carpet ends up tolerable.
Other carpet never does. Nobody knows why or how to tell in advance. According to the EPA, toluene was detected in every fragrance sample collected for a report in 1991. Green Alternatives, Nov.-Dec. Expensive disinfectants are not necessary under most circumstances according to Consumer Reports, even in the sick room where it is normally sufficient to keep the room clean with any cleaner and to wash one's hands after contact with a sick person.