April marks the start of Ozone Season in the Valley, which runs through September -- a longer-than-average season for higher levels of ozone pollution.

An expert explains why it gets hazy and which air conditions Phoenix residents need to worry about.

Friday will be the eighth day this year the Valley’s been under a high pollution warning. Continued high temperatures could lead to more ozone advisories through the weekend. 

It’s that time of year when increased temperatures create the potential for a type of air pollution you can’t see or smell. 

A year-end report on Maricopa County’s air quality shows last year was one of the worst on record. As KJZZ’s Paul Atkinson reports from Phoenix, dust storms and pollution from California played a major role.

Tackling the valley’s ozone pollution problem isn’t so simple.  A lot of it is locally produced.  But as KJZZ’s Paul Atkinson reports, we don’t have control over other sources.

The beginning of fall usually means the end of the valley’s ozone problem.  And this year was a doozy.