The strength of Yellow Tree is the strength of its relationships. Having a specialist knowledge of the combustion of fossil fuels and biomass, and having built strong relationships with the local air pollution control authorities, Yellow Tree is able to partner with industry in meeting new legislative requirements.


The law requires all users of Listed Activities (Section 21: NEM:AQA 2004) and Controlled Emitters (Section 23 : NEM:AQA 2004) to undergo emissions testing annually. In addition many factories in South Africa may require emissions testing in order to obtain ISO 14000 certification, or as a good practice to ensure that the multi-cyclones, bag filters, scrubbers, or electro-static precipitators are working correctly. This leaves many factory engineers with the problem of finding a company that can both conduct the testing to the highest standard and provide sound engineering insight regarding the findings.



National Atmospheric Emission Inventory System Registration   Atmospheric Emission License Registration   Emission Abatement Guidance and Assistance


Emission Tests

Carbon Monoxide - EPA 10B Heavy metals - EPA 29 Mercury - EPA 29
Oxides of Nitrogen - EPA 7E Oxygen - EPA 3A Sulphur Dioxide - EPA 6C
Particulate Matter - EPA 5/17 Total Volatile Organic Compounds - EPA 25B Velocity/Flow/Temperature - EPA 1,2,3
Moisture Content - EPA 4 Halogens and Halides - EPA 26 Ammonia - EPA CTM 27
Formaldehyde - EPA 316


  • Overview

    • We have an in-depth understanding of combustion processes, their operation, combustion chemistry, and the environmental law. As such if you are seeking a testing company that can provide you with insight and guidance in addition to conducting your isokinetic stack testing, then Yellow Tree is the ideal partner for your business.
  • Resources Continued

    • Section 22A - Administrative Fines 2016
    • Section 23 - Controlled Emitters 2013 Declaration of Temporary Asphalt Plants Declaration of small-scale char and small-scale charcoal plants as controlled emitters Declaration of Small Boiler as Controlled Emitter

Video Resources

We have a variety of information – from animations detailing the common problems associated with multi-cyclone operation and testing methodology. We are always adding new resources and content, so bookmark this page and check back often



Our Amazing Team

team Image
Feature Image 1

Sean Charteris


PR ENG | BSc Chemical Engineering
+27 83 307 6413; +27 21 671 4476

Feature Image 1

Caitlin Morris

Environmental Engineer

BSc Chemical Engineering
+27 83 566 2552; +27 21 671 4476

Feature Image 3

Khumbu Badantswana

Testing Assistant

National Diploma in Chemical Engineering

Feature Image 4

Raymonde Slinger

Air pollution scientist: Lead tester

BSc Environmental Science

Feature Image 5

Paul O'Brien

Air pollution scientist: Lead tester

BSc Environmental Science

Feature Image 6

Matthew Mwepu

Air Pollution Technician

National Diploma in Mechanical Engineering

Feature Image 5

Sakhumzi Baliso

Laboratory Technician

BTech Analytical Chemistry

Feature Image 5

Kyle Mcllroy

Air pollution testing assistant, LAB

BSc Mechatronics Student

Feature Image 5

Bertus Bonthuys

Operations Manager

BSc Mechanical Engineering
+27 76 917 0209; +27 21 671 4476

Feature Image 5

Mdu Mpikwa

Testing Assistant

National Diploma in Chemical Engineering

Contact Us

We would love to be of service to you. Please contact us!
Bertus Bonthuys: +27 76 917 0209; +27 21 671 4476

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