"An outflow of immigrants, or a reduction in the inflow, could actually lessen the recessionary pressures, " writes professor George Borjas, an expert on labor economics at Harvard University, in an e-mail.
"Mould (on plants) can irritate asthma, increase upper respiratory problems, cause headaches and affect concentration, " Dr. David Miller an expert on indoor air quality from Carleton University, Canada told the Globe and Mail newspaper.