Stack Emission Monitoring India | NABL Accredited

Auriga Research provides NABL-accredited stack emission monitoring services for industrial chimneys, boiler stacks, DG sets, and process vents across India. Our field teams perform isokinetic particulate sampling, gaseous emission measurement, and flue gas analysis per CPCB emission standards, US EPA reference methods, and IS 11255.

Stack emission data is essential for SPCB consent compliance, environmental clearance conditions, and CEMS validation. We measure particulate matter, SO2, NOx, CO, HCl, heavy metals, and VOCs using calibrated sampling equipment and analyse samples in our NABL-accredited laboratory.

Stack Emission Parameters

Particulate matter — isokinetic sampling per US EPA Method 5 / IS 11255
SO2 — impinger sampling and ion chromatography
NOx — chemiluminescence analyser / impinger method
CO — NDIR analyser
HCl and HF — impinger absorption method
Heavy metals (Pb, Hg, Cd, As) — US EPA Method 29 / ICP-MS
VOCs — US EPA Method 18 / canister sampling with GC-MS
Flue gas velocity and volumetric flow rate — Pitot tube traverse
Stack gas temperature, moisture content, and O2/CO2 concentration

Who Needs Stack Emission Monitoring

Industries with SPCB consent conditions requiring emission compliance
Power plants and boiler operators meeting CPCB emission norms
Cement, steel, and chemical plants under industry-specific standards
Waste incinerators requiring dioxin and furan monitoring
Facilities validating CEMS data through reference method testing

Turnaround Time

Field stack emission testing takes 1-3 days depending on the number of stacks and parameters. Laboratory analysis and reporting are completed within 10-12 business days. Expedited reporting for urgent SPCB submissions is available on request.

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Frequently Asked Questions

What pollutants are measured in stack emission monitoring?

Stack emission monitoring covers particulate matter (isokinetic sampling), SO2, NOx, CO, HCl, HF, heavy metals (Pb, Hg, Cd, As), VOCs, dioxins and furans (for waste incinerators), and opacity. Specific parameters depend on the industry category and CPCB emission standards applicable to the process. DG set monitoring typically covers PM, SO2, and NOx.

What is isokinetic sampling in stack emission testing?

Isokinetic sampling ensures the velocity of gas entering the sampling nozzle exactly matches the stack gas velocity at the sampling point. This prevents over- or under-representation of particulate matter in the sample. US EPA Method 5 and IS 11255 (Part 1) prescribe isokinetic sampling procedures. Our teams use automated isokinetic sampling trains with S-type Pitot tubes and temperature sensors for accurate velocity matching.

How frequently must industries conduct stack emission monitoring?

CPCB and SPCB consent conditions typically require stack emission monitoring twice per year (semi-annually) for most industries. Highly polluting industries (Category Red/Orange under CPCB classification) may require quarterly monitoring. Industries with Continuous Emission Monitoring Systems (CEMS) must additionally validate CEMS data through periodic manual stack testing.