Cdalecat,

It's possible that you have exercise-induced asthma. Coughing can be a symptom. EIA can occur even in folks who have never been diagnosed with allergic asthma (tho' is more common in those with allergic asthma), because cycling is a "high ventilatory" activity - i.e., you breathe a lot more than in normal daily activities.

Or, it could have just been pollution since you mention city traffic and construction, and since you were all affected, not just one of you. Riding in a rural area might be easier on your lungs, if at all possible.

You might want to do a google search on exercise induced asthma - there's tons of information out there. I take a daily medication for it (Singulair) and have found it to help my cycling somewhat, but it's not for everyone. Check with your doctor if you continue to have problems.

Good luck and keep on pedaling!

Emily