Gaseous Criteria Pollutant Monitoring as of June 24, 2009

This page last reviewed August 18, 2010

Parameter Measured	Ozone	Nitrogen Dioxide	Carbon Monoxide	Sulfur Dioxide	Hydrogen Sulfide*
Sampling Schedule	Continuous Hourly Average	Continuous Hourly Average	Continuous Hourly Average	Continuous Hourly Average	Continuous Hourly Average
Number of ARB Sites	37	15	9	4	0
Number of District Sites	139	91	68	33	13
Method Used By ARB	Ultraviolet Photometry	Gas Phase Chemiluminescence	Non-Dispersive Infrared Photometry	Ultraviolet Fluorescence Detector	Thermal Oxidizer with Ultraviolet Fluorescence Detector
EPA Reference Method	Ultraviolet Photometry	Gas Phase Chemiluminescence	Non-Dispersive Infrared Photometry	Spectrophotometry (Pararosaniline Method)	Not Applicable
Data Availability	ARB Planning and Technical Support Division, Aerometric Data Analysis and Management System ADAM); U.S. EPA Air Quality System (AQS) Air Quality and Meteorological Information System (AQMIS)

*Hydrogen Sulfide is only a State criteria pollutant. A Federal standard has not been set.