Black dust cakes the poplar trees in South Park, the San Francisco waterfront neighborhood at the western end of the Bay Bridge…

Congestion — defined as traffic flowing below 35 miles per hour on the city’s freeways — increased from 3.8 percent of the time in 2010 to 5.7 percent in 2015…
A few years ago, Rogers discovered that her gentrifying neighborhood is among the most polluted in the city. SoMa is the locus of San Francisco’s building boom, so people are pouring in and cars are jamming the streets, many of which funnel traffic to and from the Bay Bridge… (more)

The number one factor in the increase in bad air in San Francisco is construction. There are cars all over the city and the freeways are no more jammed than before, although the speeds are slower. If the following is correct, and  “Congestion — defined as traffic flowing below 35 miles per hour on the city’s freeways — increased from 3.8 percent of the time in 2010 to 5.7 percent in 2015.”, the solution would be to speed the freeway traffic up the traffic, not slow it down the way SFMTA is doing by slowing the freeway access road traffic. See the many complaints about Potrero, Van Ness, and Lombard.

This article fails to place much of the blame on the construction zones, even though the largest number of cranes in the sky are in SOMA, and Mission Bay around the Warriors stadium and the medical center, where pollution is highest.

If SB 35 passes and the construction moves west, the bad air will follow. The solid massing of buildings along narrow streets stops the breeze and traps more bad air the same way a mountain does.

Perhaps a new approach to keeping traffic out might be to move the jobs out to where the people live now rather than figuring out how to move the people to the jobs each day. Palo Alto wants to try building less office space. Sounds like a familiar approach SF tried a few years ago. Hope their legislators do a better job of writing the law than ours did wuth Prop M. hint: Use the word “must” not “shall”.