[BostonCard]

Here's the paper (it was linked in the twitter thread)

https://jkms.org/DOIx.php?id=10.3346/jkms.2020.35.e415

Here's the section you are looking for

Restaurant A was located on the first floor of a six-story building totaling 96.6 square meters in size (9.2 × 10.5 m) without windows or a ventilation system. There were two doors in the restaurant, one at the front (door 1) and the other at the back (door 2). Two ceiling-type air conditioners were diagonally located at 3.2 m from the floor as shown in Fig. 3; they were fixed with wire and had been operating at the time the cases were in restaurant A. On CCTV, case A and his companion entered the restaurant at 16:00 on June 12 and finished their meals before case B (with case D) entered at 17:15 using door 2. Case B and his colleague sat at a table near door 2, at a 6.5-m distance from case A, who did not leave from his table or share his table with others. Cases A and B engaged in conversation with their respective companions without masks. At 17:20, case A went out of the restaurant A using door 1. In 2 minutes, case C and his companions (V6, V7) entered the restaurant A using door 1 and sat at another table 4.8 m distant from case B, where they remained for 21 minutes before case B left his table using door 1 at 17:43. The distance between case A and case B was 6.5 m, and the air flow direction at positions of both cases showed a maximum of 1.0 m/sec (3.6 km/hr) velocity measured by anemometer. The air flow between case B and case C showed a maximum of 1.2 m/sec (4.3 km/hr) over a 4.8 m distance. All positions such as guest tables, infectors, and infectees, ceiling air conditioners, and information for air speed and direction are shown in Fig. 3.

You are right that there is nothing magical about being outside, per se, but airflow does tend to allow much more diffusion away from the source than in an enclosed room.  We should not assume that outdoor transmission is not possible, but at any given distance and level of protection, it seems much less likely.

BC

[BostonCard]

Here's the paper (it was linked in the twitter thread)

https://jkms.org/DOIx.php?id=10.3346/jkms.2020.35.e415

Here's the section you are looking for

Restaurant A was located on the first floor of a six-story building totaling 96.6 square meters in size (9.2 × 10.5 m) without windows or a ventilation system. There were two doors in the restaurant, one at the front (door 1) and the other at the back (door 2). Two ceiling-type air conditioners were diagonally located at 3.2 m from the floor as shown in Fig. 3; they were fixed with wire and had been operating at the time the cases were in restaurant A. On CCTV, case A and his companion entered the restaurant at 16:00 on June 12 and finished their meals before case B (with case D) entered at 17:15 using door 2. Case B and his colleague sat at a table near door 2, at a 6.5-m distance from case A, who did not leave from his table or share his table with others. Cases A and B engaged in conversation with their respective companions without masks. At 17:20, case A went out of the restaurant A using door 1. In 2 minutes, case C and his companions (V6, V7) entered the restaurant A using door 1 and sat at another table 4.8 m distant from case B, where they remained for 21 minutes before case B left his table using door 1 at 17:43. The distance between case A and case B was 6.5 m, and the air flow direction at positions of both cases showed a maximum of 1.0 m/sec (3.6 km/hr) velocity measured by anemometer. The air flow between case B and case C showed a maximum of 1.2 m/sec (4.3 km/hr) over a 4.8 m distance. All positions such as guest tables, infectors, and infectees, ceiling air conditioners, and information for air speed and direction are shown in Fig. 3.

You are right that there is nothing magical about being outside, per se, but airflow does tend to allow much more diffusion away from the source than in an enclosed room.  We should not assume that outdoor transmission is not possible, but at any given distance and level of protection, it seems much less likely.

BC