We have seen different effects radiation were on people. (See those Japanese men, women and children quite a distance away)
https://www.businessinsider.com/how-nuclear-attack-would-destroy-us-cities-2019-12#the-pentagon-and-ronald-reagan-airport-might-escape-thermal-radiation-if-a-bomb-were-detonated-over-the-national-mall-9
In the simulation below, LA's historic center is directly within the fireball, so everyone there would likely be killed.
If a fireball were to hit the city's Mission District, the Golden Gate Bridge would remain standing.
https://www.businessinsider.com/how-nuclear-attack-would-destroy-us-cities-2019-12#the-pentagon-and-ronald-reagan-airport-might-escape-thermal-radiation-if-a-bomb-were-detonated-over-the-national-mall-9
In the simulation below, LA's historic center is directly within the fireball, so everyone there would likely be killed.
If a fireball were to hit the city's Mission District, the Golden Gate Bridge would remain standing.