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Maricopa County Homepage   MARICOPA COUNTY
Air Quality Department, Bob Huhn, PIO
1001 North Central Avenue
Phoenix, AZ  85004
Ph 602-506-6713

Reduce dust when planting your winter rye grass

As we welcome cooler temperatures, we look ahead to a common fall practice: winter rye grass overseeding and scalping. The process can be a dusty endeavor. As a result, the Maricopa County Air Quality Department responds to numerous questions and concerns from landscapers, golf course managers and residents collectively doing their best to reduce the dust while working to maintain their grassy landscape.


A Dust Control Permit is not required to perform standard overseeding/scalping projects however the dust emissions generated from these projects are still regulated under Maricopa County Air Quality Rule 310.


The department’s Rule 310 states dust emissions cannot go beyond what inspectors refer to as, “20% opacity” and visible emissions cannot travel beyond the property line. In addition, while conducting any dust generating projects, the property owner and/or operator needs to keep record of the control measures they are using to reduce the dust. Examples of dust control measures include, but are not limited to, water application, trackout control devices and street sweeping.


You may report an air quality problem or polluter by calling the department at 602-372-2703 or filling out a report online: under the Contact Us tab.

The department offers the following tips to help prevent dust hazards during the overseeding process:


         Reduce the amount of land to be overseeded

         Avoid scalping on windy days

         Don’t over dry the course prior to scalping

         Apply water to moisten the ground prior to scalping

         Use a desiccant to dry out the grass

         Reduce the depth of scalping

         Keep screens and filters in good working order

         Hand rake, when possible

         Reduce/eliminate the use of blowers

         Moisten material piles before loading into dumpsters


Maricopa County’s air quality regulations are available for review on the department’s website at the following link:  


Air Quality Department compliance supervisors are available to answer additional questions at 602-506-6734.






About Maricopa County Air Quality Department


The Maricopa County Air Quality Department is a regulatory agency whose goal is to ensure federal clean air standards are achieved and maintained for the residents and visitors of Maricopa County. The department is governed by the Maricopa County Board of Supervisors and follows air quality standards set forth by the federal Clean Air Act.


The department offers air quality information and resources on its Clean Air Make More website.  Visit to learn more.


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