Don't use an "air freshener" in your home or car; the scent stays on your clothes. Never use scented detergents, fabric softeners, or anti cling products.

If you have a fireplace or wood burning stove, don't use synthetic logs. Even though they're advertised as environmentally safer, they emit chemical fumes when burned. Don't burn plastic, cardboard.

Even if you think it's unscented, if friends say it makes them feel sick, believe them. If you've been using scented products on your clothes, know that it will take many washings and outdoor airings to make them safe, and that some scented clothes may never air out. 

If You're Still scented, keep distance from people with MCS. Don't approach or hug friends without warning them and asking them if it's alright.

Don't get gasoline at a self-service pump if you're going to visit someone with  MCS.