Bahadurgarh Lab · NABL TC-7710 · On-site stack testing across India

Stack Emission Monitoring — Source Emission Testing

A missed or non-compliant stack monitoring report can jeopardise a Consent to Operate and trigger SPCB action. Auriga Research provides NABL-accredited stack emission monitoring for industrial chimneys, boiler stacks, DG sets, and process vents across India — isokinetic particulate sampling, gaseous emission measurement, and flue-gas analysis per CPCB emission standards, US EPA reference methods, and IS 11255.

Stack emissions are governed by the Air (Prevention and Control of Pollution) Act, 1981 — the basis for the SPCB Consent to Operate and its stack-monitoring conditions — and the Environment (Protection) Act, 1986, which carries the industry-specific and DG-set emission standards. We measure PM, SO₂, NOx, CO, HCl, heavy metals, VOCs, and (for incinerators) dioxins/furans against the standard applicable to your process and consent conditions.

Stack monitoring is on-site testing at your chimney, conducted by the field team from our Bahadurgarh Environmental & Industrial Monitoring Laboratory (NABL TC-7710). Backed by the Arbro Group's analytical heritage — Arbro Lab since 1990, Auriga Research since 2007 — with NABL ISO/IEC 17025 accreditation, our reports are accepted by SPCBs for Consent to Operate compliance, environmental clearance conditions, CEMS validation, and compliance audits.

On-site sampling 1–3 days | Report in 10–12 working days | Express for SPCB deadlines

Get a Quote Call +91-7428116100

Stack Emission Parameters

Each pollutant is mapped to its reference method so EHS and compliance teams can match scope to the CPCB / consent-to-operate requirement at a glance.

EPA M5 / IS 11255

Particulate Matter

Isokinetic particulate sampling per US EPA Method 5 / IS 11255 (Part 1) with S-type Pitot velocity matching.

SO₂

Sulphur Dioxide

Impinger sampling with ion chromatography / titrimetric finish.

NOx

Oxides of Nitrogen

Chemiluminescence analyser or impinger absorption method.

Carbon Monoxide

Non-dispersive infrared (NDIR) analyser.

HCl / HF

Acid Gases

Hydrogen chloride and hydrogen fluoride by impinger absorption.

EPA M29

Heavy Metals

Pb, Hg, Cd, As and other metals by US EPA Method 29 / ICP-MS.

EPA M18

VOCs

Volatile organic compounds by canister sampling with GC-MS per US EPA Method 18.

Pitot Traverse

Velocity & Flow

Flue gas velocity and volumetric flow rate by S-type Pitot tube traverse.

Flue Gas

Temp / Moisture / O₂

Stack gas temperature, moisture content, and O₂ / CO₂ concentration.

PCDD / PCDF

Dioxins & Furans

Dioxin and furan sampling for waste incinerators and co-processing units.

DG Set

Genset Emissions

PM, SO₂, and NOx against the applicable MoEFCC / CPCB diesel-genset emission standard for the set's capacity.

How It Works

Get a Quote & Site Plan

Share your industry category, the number and type of stacks / DG sets, the parameters required, and your Consent to Operate conditions. Your dedicated SPOC confirms the applicable CPCB / industry-specific standard, the sampling-platform requirements (port size, access), and the on-site schedule before mobilisation.

On-Site Stack Sampling

The Bahadurgarh lab field team mobilises to your site with isokinetic sampling trains (S-type Pitot, EPA Method 5 / IS 11255), flue-gas analysers, and impinger trains, and samples each stack across a multi-point traverse. Collected samples and on-site readings are bar coded and registered in YLIMS on return to the lab.

Laboratory Analysis & QA Review

Particulate filters and impinger solutions are analysed at the Bahadurgarh lab (NABL TC-7710) — gravimetry, ion chromatography, ICP-MS, GC-MS as applicable — and emission concentrations and mass rates computed against the applicable standard. Every result passes a formal internal QA review and sign-off before the report is generated.

Receive Your NABL Report

Your NABL-accredited stack emission report is delivered digitally within the committed turnaround time. Reports carry Auriga's NABL accreditation under ISO/IEC 17025:2017, present the measured concentration and mass rate against the applicable CPCB standard, and are accepted by SPCBs for Consent to Operate, clearance conditions, and CEMS validation. Track status in real time through YLIMS.

Turnaround Time

Service	Standard TAT	Express
On-site stack sampling (per site)	1–3 days	Scheduling priority
Particulate (isokinetic) + gaseous report	10–12 business days	Available
Heavy metals (EPA Method 29)	10–14 business days	On request
VOCs (EPA Method 18 / GC-MS)	10–14 business days	On request
Dioxins & furans (incinerators)	By project scope	On request
DG-set emission report	7–10 business days	Available

Who Needs Stack Emission Monitoring

Large industries with stacks requiring half-yearly emission monitoring under Consent to Operate conditions.
Power plants and boiler operators meeting CPCB / industry-specific emission norms.
DG-set operators above the specified capacity needing genset emission compliance.
Industries undergoing environmental compliance audits or renewing their Consent to Operate.
Cement, steel, chemical, and refinery plants under category-specific emission standards.
Waste incinerators and cement co-processing units requiring dioxin / furan monitoring.
Facilities with Continuous Emission Monitoring Systems (CEMS) needing reference-method validation.
Industries under environmental clearance conditions with stack-monitoring commitments.
EIA consultants assembling source-emission data for dispersion modelling.
Red / Orange category units (CPCB classification) on quarterly or monthly monitoring conditions.

Why Auriga for Stack Emission Monitoring

Bahadurgarh Environmental Lab — NABL TC-7710

Auriga's primary environmental monitoring facility mobilises the field team and analyses the samples under one NABL accreditation — reports accepted by SPCBs without follow-up scope verification.

Isokinetic sampling done right

Automated isokinetic trains with S-type Pitot velocity matching and multi-point traverse per US EPA Method 5 / IS 11255 — the procedure SPCB reviewers expect for a defensible particulate result.

Air Act 1981 & EP Act 1986 framework

Results reported against the CPCB / industry-specific standard tied to your Consent to Operate under the Air Act 1981 and the emission standards under the Environment (Protection) Act 1986.

DG-set & incinerator capability

Diesel-genset emission testing against the applicable MoEFCC / CPCB standard, and dioxin / furan sampling for waste incinerators and co-processing units.

Pairs with ambient air & met monitoring

Stack, ambient air-quality, and meteorological monitoring run by the same lab — internally consistent inputs for dispersion modelling and a single environmental dataset.

Arbro Group analytical heritage

Established analytical heritage through the Arbro Group (Arbro Lab since 1990, Auriga Research since 2007), with NABL ISO/IEC 17025 accreditation — the audit trail EHS managers and SPCB reviewers look for in a source-emission partner.

Related Services

Frequently Asked Questions

What legislation governs stack emissions in India?

Industrial stack emissions are governed primarily by the Air (Prevention and Control of Pollution) Act, 1981 and the Environment (Protection) Act, 1986 with the rules and emission standards notified under them. The Air Act 1981 is the basis on which the State Pollution Control Board (SPCB) grants Consent to Operate (CTO) and attaches the stack-monitoring conditions; the Environment (Protection) Act 1986 and the Environment (Protection) Rules carry the industry-specific and general emission standards (and the genset / DG-set standards). Auriga measures and reports your stack emissions against the CPCB / industry-specific standard applicable to your process and consent conditions.

Which Auriga lab and team conduct stack emission monitoring?

Stack emission monitoring is conducted on-site at your chimney / vent by the field team from our Bahadurgarh Environmental & Industrial Monitoring Laboratory (NABL TC-7710), Auriga's primary environmental monitoring facility whose NABL ISO/IEC 17025:2017 scope covers the relevant air / emission parameters. The team mobilises with isokinetic sampling trains and flue-gas analysers, collects the samples at the stack sampling platform, and the collected samples are analysed at the Bahadurgarh lab — the report is issued under its NABL accreditation.

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, so the particulate sample is neither over- nor under-represented. US EPA Method 5 and IS 11255 (Part 1) prescribe the isokinetic procedure. Our teams use automated isokinetic sampling trains with S-type Pitot tubes and temperature sensors for accurate velocity matching, with a multi-point traverse across the stack cross-section.

What pollutants are measured in stack emission monitoring?

Stack emission monitoring covers particulate matter (isokinetic), SO2, NOx, CO, HCl, HF, heavy metals (Pb, Hg, Cd, As), VOCs, dioxins and furans (for waste incinerators), and opacity, plus flue-gas velocity, temperature, moisture, and O2/CO2. The exact parameter set depends on the industry category and the CPCB / industry-specific emission standard applicable to the process. DG-set monitoring typically covers PM, SO2, and NOx against the applicable genset standard.

What emission standards apply to DG sets (diesel gensets)?

Diesel generator (DG) set emissions are regulated under the Environment (Protection) Act 1986. MoEFCC / CPCB first notified diesel-genset emission standards in 2002, and these have been revised since — most recently the engine emission norms for new gensets that tightened the limits and introduced capacity-based requirements. The applicable limits depend on the genset's power rating category and date of manufacture, so we test your set against the standard that actually applies to it rather than quoting a single fixed limit. Confirm your genset capacity and model year with your SPOC so the correct standard is referenced in the report.

How frequently must industries conduct stack emission monitoring?

CPCB / SPCB Consent to Operate conditions typically require stack emission monitoring twice a year (half-yearly / semi-annually) for most industries. Highly polluting industries (Red / Orange category under CPCB classification) may carry quarterly or monthly conditions. Industries with Continuous Emission Monitoring Systems (CEMS) installed must additionally validate the CEMS data through periodic manual reference-method stack testing. Auriga schedules the monitoring to your specific consent frequency.

Are Auriga stack emission reports accepted by SPCBs and for compliance audits?

Yes. Because monitoring is performed under the Bahadurgarh lab's NABL TC-7710 accreditation using CPCB / US EPA / IS reference methods, the reports are accepted by State Pollution Control Boards for Consent to Operate compliance, for environmental clearance conditions, for CEMS validation, and in environmental compliance audits. Reports include the measured emission concentration and mass rate against the applicable standard, with the accreditation reference, formatted for direct SPCB submission.

Get a Tailored Recommendation

Talk to a Testing Expert