New report tackles a pollution puzzle: while other pollutants drop on weekends, smog-causing ozone levels actually increase over the weekend in certain parts of California.
In the Los Angeles area, ozone levels typically are 32 percent higher on Saturdays and Sundays than they are Monday through Friday when freeways are clogged with commuters. The difference is 25percent in San Francisco. The phenomenon in Los Angeles and San Francisco, first noticed in the 1980s, has four possible explanations, according to the report.
Thanks to Abhijeet Chavan
FULL STORY: Report cites several reasons for weekend smog increase
Planetizen Federal Action Tracker
A weekly monitor of how Trump’s orders and actions are impacting planners and planning in America.
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Judge Halts Brooklyn Bike Lane Removal
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Engineers Gave America's Roads an Almost Failing Grade — Why Aren't We Fixing Them?
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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.
Planning for Universal Design
Learn the tools for implementing Universal Design in planning regulations.
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