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The original item was published from 9/21/2022 9:32:56 AM to 11/30/2022 12:05:00 AM.

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Air Quality

Posted on: September 21, 2022

[ARCHIVED] Reduce Dust When Planting Winter Ryegrass

Overseeding_Press Release Image (002)

PHOENIX (September 21, 2022) — The Maricopa County Air Quality Department (MCAQD) encourages commercial and resort properties, golf courses, government agencies, and residents to take dust reduction measures when planting winter ryegrass this fall. Scalping existing Bermuda grass prior to overseeding can impact air quality by generating dust. Each year MCAQD responds to questions and concerns from landscapers, golf course managers, and residents regarding the dust created during the overseeding process. 


MCAQD offers the following tips to help prevent dust during the overseeding process:


  • Avoid scalping on windy days and on High Pollution Advisory days. 
  • Don’t over-dry the area prior to scalping. 
  • Apply water to moisten the area prior to scalping.
  • Reduce the area to be overseeded and the depth of scalping.      
  • Keep dust collection screens and filters in good working condition. 
  • Sweep loose debris from paved surfaces instead of using a leaf blower, see the P-25 Ordinance.    
  • Moisten material piles before loading into dumpsters.


Generally, overseeding/scalping projects do not require a dust control permit. However, the dust emissions generated during these projects are still regulated under MCAQD’s Rule 310. Visible dust emissions beyond the property line may result in an air quality violation.      


Residents may report air quality or dust control concerns by calling 602-372-2703 or filing online at


View our Overseeding Tips for Dust Control help sheet, available in English and Spanish. Please check with local municipalities for possible additional restrictions. 




Ari Halpert

602-501-1266 cell

602-506-6713 desk




About Maricopa County Air Quality Department

MCAQD’s mission is to improve the air of Maricopa County so customers, residents, and visitors can live, work, and play in a healthy environment. MCAQD is governed by the Maricopa County Board of Supervisors and follows air quality standards set forth by the federal Clean Air Act. For air quality information and resources, visit

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Download MCAQD’s Clean Air Make More app! It is free to download and use and is available on the App Store for iPhone and iPad and on Google Play for Android.

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