We're interested in approaches that could apply in situations where affected residents might not have continuous access to cell phones or wifi.
This is a complementary question to conversations about how to use text notifications to communicate air quality data (example here).
Thank you for any ideas or examples!
For real-time alerts, one option is an air quality flag program. This one from the US EPA uses colored flags that correspond with its Air Quality Index (AQI) colors: https://www.airnow.gov/air-quality-flag-program/
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Some states use the electronic DOT signs along major road ways to alert to ozone or air quality issues.
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