At "hazardous" levels, the region is experiencing an air quality emergency. Those with chronic respiratory or cardiovascular conditions are more at risk of developing serious health issues as ...

Hazardous air quality levels are indexed at 300 or higher. As the day progressed, levels dropped from 325 to 182, improving the quality of the air to "unhealthy" rather than hazardous.

For much of today, Syracuse’s air has been in the “hazardous” range, the worst of five air pollution categories. At 1 p.m., the air quality index, which ranges from zero to 500, reached 438 ...

Air quality in the Sacramento area reached hazardous levels Tuesday morning, with one air quality index measurement of 484 raising an alarm for anyone who checks those numbers regularly. A reading ...