State declares Air Quality Action Day as particulate levels riseCode Orange represents unhealthy pollution levels for sensitive people.Code Orange represents unhealthy pollution levels for sensitive people.
Source: State declares Air Quality Action Day as particulate levels rise (https://www.post-gazette.com/news/health/2019/02/04/State-declares-Air-Quality-Action-Day-as-particulate-levels-rise/stories/201902040113)