The   Oceano   Dunes   State   Vehicle   Recreation   Area   (SVRA)   emits   significantly   more   particulate   matter (PM)   dust   than   the   natural   background   emission   levels   measured   in   non-riding   dune   areas.      This   fact   is apparent   in   the   aerial   photograph   (left)   of   the   Nipomo   Mesa.      The   visible,   concentrated   dust   plume originates   from   the   SVRA   riding   area   and   extends   over   the   southwest   part   of   the   mesa.      No   plume   is visible north or south of this. Unnatural   PM   concentrations   are   emitted   from   the   Oceano   Dunes   SVRA   any   time   there   is   on-shore wind.      However,   during   periods   of   high   wind   the   concentrations   frequently   exceed   the   PM10   and   PM2.5 health   standards   established   by   the   California   Air   Resources   Board ,   and   violate   the   San   Luis   Obispo County   Air   Pollution   Control   District   (APCD)   Rule   1001 .         On   June   12,   2017   the   APCD   Air   Pollution   Control Officer issued a Notice of Violation  to the State Parks OHMVR Division Acting Deputy Director. PM   dust   pollution   levels   are   measured   by   the   APCD   at   several   monitoring   sites   in   the   South   County area.      The   data   from   these   sites   is   used   to   issue   forecast   PM   pollution   alerts,   and   to   document   violation of air quality standards.           
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Map showing the location of PM concentration measurement stations monitored by the APCD.
SLO County Air Pollution Control District
APCD Rule 1001 text, which establishes criteria for determining acceptable levels of PM emissions from the Oceano Dunes SVRA.
SLO County Air Pollution Control District
This report describes the steps taken by the APCD to meet SB 656 and develop control strategies to reduce PM from local sources.
SLO County Air Pollution Control District
Report documents results of a year long study of PM emissions on Nipomo Mesa.
SLO County Air Pollution Control District
Report summarizing Phase 1 and Phase 2 South County PM Studies.  Conclusion: Off-Highway vehicle activity in the SVRA is a major contributing factor to the high PM concentrations observed on the Nipomo Mesa.
SLO County Air Pollution Control District
Report on San Luis Obispo Count air quality for 2015. 
SLO County Air Pollution Control District
California ambient PM concentration health standards.
California Air Resources Board
Notice of violation letter to Deputy Director, OHMVR Division from APCD Air Pollution Control Office, dated June 12, 2017.
SLO County Air Pollution Control District
How to link to California Air Resource Board air quality database query tool and find historical PM data for South County. 
California Air Resources Board
How to link to air quality alert services. South County. 
SLO County Air Pollution Control District

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