On Sunday, my wife and I hung some vinyl wallpaper. As we were working, she became increasingly congested, and by the time we were finished, she was having some difficulty breathing, and I had developed a runny nose. We opened a window, left the room, and closed the door. After getting some fresh air, our symptoms subsided.
On Monday, we hung some vinyl border in the same room, with the same symptoms -- except I began sneezing, too. As the previous night, an hour or so after we went into our own room, we were both feeling better.
Has anybody ever heard of this before? Neither of us has any other allergies and rarely gets sick.