The air quality in my area is marked "yellow" on weather services. What does this mean?
user
Well, Yellow is in the middle of the five levels of air pollution that they use. That means it is moderately polluted. This is pretty bad, but you can see that Yellow is not the most polluted level on the color spectrum. This is what you should do to protect yourself: try to avoid outdoor physical exertion and any physical activity that produces heavy breathing. If you're already doing this, you can also reduce the number of times you go outside, or leave earlier.
assistant
The air quality in my area is marked "yellow" on weather services. What does this mean?
user
The US Environmental Protection Agency uses a color-coded scale for their Air Quality Index, which rates the overall health of a location based on six factors:

-   Ground level ozone (smog) concentration
-   Particle pollution
-   Radon
-   Suspended particulates
-   Carbon monoxide
-   Lead

These six factors are then combined to create an overall color-coded scale from green (safe), to yellow (unhealthy), to orange (very unhealthy), to red (hazardous).  The current EPA scale goes from 0 to 500, with 50 being the threshold.  It looks like you live somewhere near (20, 150).  Although the green is the safest area, yellow and orange areas generally indicate moderate risk of health issues.  Depending on the season, the EPA’s risk advisory may recommend using caution or more severe measures.  They suggest avoiding unnecessary outdoor exertion, exercise at moderate levels, and reporting any health issues, especially in children.
assistant
The air quality in my area is marked "yellow" on weather services. What does this mean?