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Given that Vancouver has good air quality, the difference between living 150 meters from a highway vs. further might be more pronounced than if living in LA where the baseline pollution level is high enough that living next to a highway doesn't give meaningfully higher exposure.

L.A. keeps building near freeways, even though living there makes people sick[1].

[1] https://www.latimes.com/projects/la-me-freeway-pollution/

I was thinking the same. Most major urban areas have air quality issues and warnings.