You might want to try an air purifier. Read here for more info:

http://www.queenswest.com/neighborhood/discussion/00007801?b_start=0#00007820

 if you're living in a brand new building, it might be 'formaldehyde'?

http://epa.gov/iedweb00/formalde.html

I've been in LIC for almost 2 years and I've been fine. =)

I've been here since 2000 and in 2001 (when Avalon south was being built) started suffering from severe allergies and chemical sensitivity. By 2003 I began having painful chronic sinusitis & my allergies no longer responded to meds. In 2004 I began getting allergy shots & it has really helped control my symptoms, but the sinusitis continued to be a huge problem & I developed asthma. I have had sinus surgery twice (2005 & 2007.) After being constantly sick from 2001-2007, often spending 6 months a year or longer on antibiotics for sinusitis, I am really happy to say that I have not had sinus problems, or even a common cold, since having sinus surgery 14 months ago. However I still have asthma. Over the years I have been to so many Otolaryngologists & every single one has cited the heavy construction in the neighborhood as the likely cause of all the respiratory problems I've been having since living in LIC.