Are healthy children part of the "Unhealthy for Sensitive Groups" category? How are your particle pollution maps calculated? How do we know if it's OK to let the kids play/do sports outside? What are the standards for the six common (criteria) pollutants? What is particle pollution? What is the AQI? Where can I find air quality trends? Where can I find historical or archived data? Which cities have the best (or worst) air quality? Why is a particle pollution map not available? Will a mask protect me from wildfire smoke?