The 1990s saw a tremendous growth in air monitoring and emissions control. On November 15, 1990, the Clean Air Act Amendment of 1990 was signed. This act was designed to remove 56 billion tons a year of air pollution, reduce acid rain by 50% and reduce toxic air pollutants by 75%.

In support of the CAAA, Matheson Gas Products offers a full line of Environmental Compliance Standards. We understand the value of accuracy and repeatability to our customers. Matheson calibration standards offer repeatable and precise calibrations to the end user. Our continuous involvement with the environmental marketplace gives us a unique understanding and perspective on its needs.

Matheson offers the following Gas Calibration Standards:

• EPA Protocols
• CalMAT™ Daily Standards
• VOC Mixtures

Continuous Emissions Monitoring systems (CEMs) for gaseous pollutants must be calibrated and audited using gas standards that are traceable directly to NIST Reference Standards. Because of the critical tolerance requirements imposed by amendments to the Clean Air Act of 1990, and revised in 1997, Matheson has instituted an NIST Traceable Reference Material (NTRM) Program. This allows the user to obtain a gas mix that is only one generation from the actual Standard Reference Material (SRM), thus reducing the error an increasing the precision of the blend.

Benefits of Matheson EPA Protocol Gases:

• Precision analytical accuracy of mixes up to ±1%
• Certificates of Analysis and labeling procedures as prescribed by EPA guidelines.
• Point of use stocking programs reducing lengthy cylinder lead times.
• A full complement of support gas equipment to meet the user's needs.
• Personnel trained in the environmental marketplace to assist you with your requirements.
• Productivity Enhancement Audits to assist in optimizing your gas delivery systems.

In 1998 the EPA instituted changes to the protocol procedures. The purpose was to revise and improve the statistical procedures in the 1993 version of the protocol. Matheson has fully implemented a NIST Traceable Reference Material with these changes in mind. Matheson's NTRMs have the highest level direct traceability to actual Standard Reference Material (SRM), thus providing the most precise, accurate blends and reducing the potential for analytical inaccuracy of the blend. They are directly traceable to actual standard Reference material (SRM), thus reducing the potential for analytical inaccuracy of the blend.

NOTE: Request BR-48 for more information.

Many sources are required to monitor their emissions, but do not require an EPA Protocol Standard to do daily calibrations. Matheson's Cal-MAT-1™ and Cal-MAT-2™ Daily Standard Mixtures are designed to meet your daily calibration needs when an EPA Protocol mixture is not required. The Cal-MAT™ Daily Standards are designed to meet and exceed performance guidelines set forth by the compliance regulations. Cal-MAT™ Daily Standards can be customized to specific customer needs. If your requirement is not listed, please contact your closest Matheson branch.

The following table outlines the mixture specifications for Matheson's EPA protocol, Cal-MAT-1™ and Cal-MAT-2™ standards.

Mixture Grade	Blend Technique	Blend Tolerance		Certification Accuracy	Certification	NIST Traceability
EPA Protocol	Gravimetric or Partial Pressure	5%-50%	±1%	1%	Single	SRM, NTRM
		500 ppm5%	±2%
		1 ppm500 ppm	±5%
Cal-MAT-1™	Gravimetric or Partial Pressure	5%50%	±1%	1%	Single	NTRM or Lab Std or Weight
		500 ppm5%	±2%
		1 ppm500 ppm	±5%
Cal-MAT-2™	Gravimetric or Partial Pressure	5%50%	±5%	2%	Single	Lab Std or Weight
		500 ppm5%	±10%
		1 ppm500 ppm	±20%

Volatile Organic Chemicals are toxic chemicals believe to aid in ozone formation in the atmosphere. AREAL (EPA Atmospheric Research and Exposure Laboratory) has developed a number of methods for measuring these components in ambient air. These methods provide a standardized format for sampling and analysis of VOCs.

Matheson has developed calibration standards for the Ozone Precursor, TO-14 and TO-15 Methods. We offer the full set of VOCs for our TO-14 method and subsets of both the TO-14 and TO-15 methods. Concentrations are available at both the 1 PPM and 100 PPB levels. Continuous research and development has allowed Matheson to manufacture VOC blends to the low part per billion (ppb) range. These blends have proven stability and have a guaranteed shelf life of one year.

NOTE: Request BR-49 and TB-363 for more information.