Air pollution is so bad in Mexico City that residents have less sensitivity to smells, according to a recent study.
"Tests showed people in Mexico City -- a sprawling metropolis crammed with around 20 million people and 4 million cars -- struggled to sniff out everyday odors like coffee and orange juice compared to residents of a nearby town."
"Their noses are so badly damaged from a life inhaling toxic particles that they also find it harder to detect the scent of rotten food, said researcher Robyn Hudson who ran the study."
"Mexico City is one of the world's most polluted capitals, along with Beijing, blighted by its thin high-altitude air and a ring of surrounding mountains that trap exhaust fumes belched from smoky buses and factories on the city outskirts."
"Mexico City's ozone levels exceed World Health Organization standards on approximately 300 days of the year."
FULL STORY: Mexico City smog hurting people's sense of smell

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Urban Design for Planners 1: Software Tools
This six-course series explores essential urban design concepts using open source software and equips planners with the tools they need to participate fully in the urban design process.
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City of Albany
UCLA Lewis Center for Regional Policy Studies
Mpact (formerly Rail~Volution)
Chaddick Institute at DePaul University
City of Piedmont, CA
Great Falls Development Authority, Inc.
HUDs Office of Policy Development and Research