Photo of downtown Phoenix skyline and moderate air pollution

What is a High Pollution Advisory?

High levels of air pollutants such as ozone and particulate matter pose health risks. Children, active adults and those with respiratory illnesses should restrict outdoor activities.

Pollution Prevention Tips:

  • Reduce driving alone and instead, take transit, carpool, or telework
  • When driving, combine trips and limit idling
  • Refuel after dark
  • Use electric-powered lawn and garden equipment

Travel Reduction Program (TRP) employers:

Implement HPA measures as outlined in the TRP Annual Plan, which may include posting flyers, sharing electronic communications and conducting drawings.


2021 PM 10 & PM-2.5 HPAs

  • January 1, 2021 (PM-2.5 & PM-10)
  • January 2, 2021 (PM-10)
  • March 25, 2021 (PM-10)

2020 Ozone HPAs (37)

  • April 25, 28, 29, 30 (4) 
  • May 5, 6, 7, 15, 16, 25, 26, 29, 30 (9) 
  • June 2, 3, 4, 10, 11 (5) 
  • July 15, 16, 28, 29, 30, 31 (6)
  • August 1, 2, 18, 19, 22, 23, 24, 25, 26, 27 (10)
  • September 4, 16, 17 (3)

2020 PM-10 & PM-2.5 HPAs

  • January 1, 2020 (PM-2.5 & PM-10)
  • August 17, 2020 (PM-10)
  • December 18, 19, 20, 24, 25, 26, 31 (PM-2.5)

2019 PM-10 & PM-2.5 HPAs

  • January 1, 2019 (PM-2.5)
  • April 10, 2019 (PM-10)
  • May 16, 2019 (PM-10)
  • July 13, 2019 (PM-10)
  • July 22, 2019 (PM-10 & PM-2.5)
  • December 31, 2019 (PM-2.5)

2019 Ozone HPAs (43)

  • April 19, 25, 26 (3)
  • May 14, 15, 30 (3)
  • June 8, 9, 10, 11, 12, 15, 24, 25, 28, 29 (10)
  • July 10, 23, 24, 25, 26, 29, 30 (7)
  • August 1, 2, 3, 4, 5, 6, 7, 8, 13, 14, 15, 19, 20, 21, 30, 31 (16)
  • September 1, 2, 3, 6 (4)

Get in Touch

Commute Solutions

For TRP implementation assistance

(602) 262-7433