Aerosol is the ONLY way to explain superspreading

SARS-CoV-2 looms as an obstacle preventing these disc-hucking titans from returning to the pitch {Raja, Keenan, Lun, Dave, Alex, Andy, Vadim, Beau, Jim, Chris, Sherri, Peter}. Photo by Frank.

In digging deep into the world of aerosol SARS-CoV-2 transmission (small airborne particles that travel more than six feet and linger in the air for hours), I am flabbergasted. We’re in an all-out war with COVID, spending trillions, but we’re uneducated, disorganized, and divided. Throughout the U.S., deadly health orders prioritize rare surface transmission and fail to mention aerosol.

Pre-COVID, I played goaltimate frisbee at Palo Alto’s Greer Park with my buddy Frank Vigil. We both had sports and professional interests in COVID. We both want to get safely back on the…


To my way of thinking, we need an additional Robert Britt explainer:

* $130 CO2 meters & measuring indoor air safety

https://steveraney.medium.com/six-deadly-covid-transmission-myths-11f1038eb81e

* Mitigating stagnant indoor air: It's like smoke, recirculation, MERV-13, air changes per hour, big vs. small particles, Guangzhou (or other) case study, 2 outdoor cases & 7,232 indoor out of 7,234 cases. https://youtu.be/u6L62Zx4dkU

HVAC should be #2 priority after masks.

It's worth watching Kim Prather and Linsey Marr battle the forces of ignorance on Twitter. Marr just testified to a Congressional Committee.


Six Deadly COVID Transmission Myths

Flawed guidance comes from the CDC

On Jan 24 in Guangzhou, A1 infected 9 people at 3 tables because bad ventilation blew exhalations over the tables. Safer buildings suck virus particles out & bring in fresh outdoor air.

County officials claim, “We are too busy dealing with ICU under-capacity to worry about reducing ICU demand via improved public health orders.” This reflects practical realities. Flawed guidance comes from the CDC, thwarting efforts to improve County health orders. The six deadly myths:

  • Aerosols (small airborne particles) aren’t important
  • Cleaning surfaces should be a top priority
  • CDC believes it’s own guidance
  • Residents and workers can’t measure indoor air safety
  • We can’t halve transmission
  • Leaders shouldn’t challenge the CDC’s flawed guidance.

MYTH 1: Aerosols aren’t important

FACT: Indoor aerosols, small…


The pattern will change, but not dramatically

Silicon Valley Traffic. Photo credit: Shutterstock

Back when commuting was normal in 2019, the U.S. split between different travel modes was 76% drive alone, 9% carpool, 5% transit, 2.5% walk, and 5% work from home. Six metropolitan areas had high transit use: NYC, SF, Boston, DC, Chicago, and Seattle, ranging from 32% in NYC down to 11% in Seattle.

In the middle of our shrunken COVID-19 economy, data sources have total Bay Area automobile driving down by 61% (INRIX) and 86% (StreetLight Data), with average 9 am driving speed up from 30 to 60 mph on the worst portion of Highway 101. Bay Area transit ridership…

Steve Raney

Executive Director at Palo Alto Transportation Mgmt Assoc.

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