AERMOD Air Dispersion Modelling in Delhi NCR (Delhi, Gurugram, Noida, Faridabad, Ghaziabad)
Regulatory AERMOD studies for real estate EC, industrial CTE/CTO and EIA projects across Delhi NCR, with honest treatment of high background PM, winter inversions and CAQM requirements.
AERMOD Studies for Projects in Delhi NCR
Delhi NCR is one of the most closely watched airsheds in India. Projects here are assessed against a background that already carries high particulate levels for much of the year, and regulators, appraisal committees and the public all expect the air quality chapter of an EIA or consent application to be defensible. A well-built AERMOD study shows clearly what a new building, factory or expansion adds to the ground-level concentrations around it, at which receptors, and over which averaging periods.
DSTechnoverse prepares regulatory AERMOD dispersion studies for sites in Delhi, Gurugram, Noida, Greater Noida, Faridabad, Ghaziabad, Sonipat and the wider National Capital Region. We work for developers, manufacturers and, very often, as a white-label modelling partner for EIA consultancies that hold the client relationship. The method follows our standard AERMOD air dispersion modelling workflow, adapted to the regulatory and meteorological conditions specific to NCR.
DPCC, HSPCB and UPPCB: Consent Practice Across NCR
NCR spans three jurisdictions, and the consent authority depends on where the site sits. Projects within the National Capital Territory deal with the Delhi Pollution Control Committee (DPCC). Gurugram, Manesar, Faridabad, Sonipat and Bawal fall under the Haryana State Pollution Control Board (HSPCB). Noida, Greater Noida and Ghaziabad come under the Uttar Pradesh Pollution Control Board (UPPCB). Each runs its own online consent system for Consent to Establish (CTE) and Consent to Operate (CTO), and each has its own regional offices and practice on what supporting studies are expected.
Dispersion modelling is most commonly required through the Terms of Reference of an EIA, for larger and red category units, for expansions that increase emissions, and where stack height or fuel changes need justification. Environmental clearance for category B projects is handled by the State Level Environment Impact Assessment Authority (SEIAA) and State Expert Appraisal Committee (SEAC) of Delhi, Haryana or Uttar Pradesh as applicable, while category A projects go to the Ministry of Environment, Forest and Climate Change. Because requirements vary by board, sector and project size, we always advise confirming the scope with the regional office before the study is finalised.
CAQM and GRAP: What They Mean for NCR Modelling
The Commission for Air Quality Management in NCR and Adjoining Areas (CAQM) sets air quality directions that apply across all NCR states, over and above the usual consent conditions. Its Graded Response Action Plan (GRAP) is triggered in stages as the Delhi AQI worsens, from Stage I (Poor) through Stage II (Very Poor) and Stage III (Severe) to Stage IV (Severe+). Each stage adds restrictions on top of the previous one.
Two parts of this matter directly for modelling. First, diesel generator sets: CAQM directions regulate DG set use in NCR, including emission control or gas-based and dual-fuel requirements for larger sets, and GRAP stages progressively restrict DG operation, generally allowing only emergency and essential services at the higher stages. Second, construction and demolition: dust control measures apply at all times, and at the higher GRAP stages most construction and demolition activity is halted, with limited exceptions for specified categories of projects. The exact current rules change through CAQM orders, so we read the latest directions for each project.
In practice this means a DG set scenario in an NCR study should reflect realistic standby operation and the emission control actually proposed, and the construction dust scenario should show the mitigation the developer is committing to, not an uncontrolled case presented as normal operation.
Real Estate EC in Gurugram and Noida: DG Sets and Dust
Gurugram, Noida and Greater Noida generate a steady stream of building and construction projects that need environmental clearance under the EIA Notification 2006. Item 8(a) covers building and construction projects with built-up area from 20,000 to 1,50,000 m², and item 8(b) covers township and area development projects of 50 ha or more, or 1,50,000 m² built-up area and above. Large residential towers, commercial office campuses, data centres, malls, hospitals and mixed-use townships along the Dwarka Expressway, Golf Course Extension Road, the Noida Expressway and the Yamuna Expressway corridor are typical examples.
For these projects the modelled sources are usually standby DG sets during the operation phase and fugitive dust and equipment exhaust during construction. We set up DG stacks as point sources with their real heights relative to the building, consider building downwash where stacks sit on or beside tall blocks, and place receptors at nearby housing, schools and hospitals. Our guide on environmental consultants for construction and real estate and the article on building downwash and BPIP explain the approach in more detail.
Industrial Areas Across Delhi NCR We Model
NCR has a dense and varied industrial base, and each cluster brings its own source types and regulatory history.
- Manesar and IMT Manesar: automotive and auto component plants, paint shops, foundries and engineering units with boilers and DG sets.
- Bawal and the Rewari belt: automotive suppliers, engineering and process industries in HSIIDC estates.
- Faridabad: a long-established industrial city with engineering, forging, electroplating, rubber and chemical units.
- Ghaziabad: metal processing, chemicals, distilleries and mixed industrial estates such as Sahibabad and Loni.
- Noida and Greater Noida: electronics, mobile manufacturing, data centres, pharmaceuticals and light engineering.
- Sonipat and Kundli: food processing, footwear, warehousing and new industrial estates along the Delhi border.
- Delhi itself: approved industrial areas such as Okhla, Narela, Bawana and Wazirpur, where expansions and consent renewals are common.
Critically Polluted Areas and Background Air Quality in NCR
In the Comprehensive Environmental Pollution Index (CEPI) assessment carried out by the Central Pollution Control Board in 2009-10, Ghaziabad, Noida, Faridabad and the Najafgarh drain basin in Delhi were identified as critically polluted areas, as was Bhiwadi in the Rajasthan part of NCR. CEPI status has since been reassessed and moratoria have been imposed and lifted at different times, so we check the current position for each site. Delhi, Noida, Ghaziabad and Faridabad are also among the cities listed under the National Clean Air Programme (NCAP).
The practical issue is that baseline PM10 and PM2.5 in NCR often already exceed the National Ambient Air Quality Standards, especially in winter. A project cannot change that, and a study should not hide it. We present results honestly: the predicted incremental contribution from the project, the measured baseline, and the resulting total, side by side. We then express the increment as a share of the standard and of the background, show where the maximum falls, and set out the mitigation that keeps the increment as small as practicable. Appraisal committees respond far better to this than to a report that buries an exceedance. Our article on cumulative air quality impact assessment covers the method.
Meteorological Data for Delhi NCR Studies
NCR has good surface meteorological coverage. Indira Gandhi International Airport at Palam is the main aviation station, and the India Meteorological Department (IMD) observatory at Safdarjung is the long-running reference station for Delhi. For sites in Gurugram, Noida, Faridabad or Ghaziabad, we compare these against site-specific monitoring collected during the baseline season and choose the station that best represents the project location. Upper-air information or a mixing-height approach is added to complete the AERMET processing.
Winter is the critical season in NCR. Clear nights, light winds and strong surface-based inversions trap emissions close to the ground, and low-level sources such as DG sets and construction activity can give their highest predicted concentrations in these hours. The summer pre-monsoon period brings dust-laden westerly and north-westerly winds, while the monsoon shifts flow towards the east and south-east. Most of NCR is flat alluvial plain, but the Aravalli ridge around south Delhi, Gurugram and Faridabad can matter for receptors at elevation. See our guides on meteorological data for air modelling in India and averaging periods and NAAQS compliance.
Typical NCR Modelling Scenarios
- DG set stacks for high-rise residential, commercial and data centre projects in Gurugram, Noida and Greater Noida, including stack height checks against CPCB guidelines.
- Boilers, thermic fluid heaters and process stacks for plants in Manesar, Bawal, Faridabad and Ghaziabad, with fuel switching to PNG or cleaner fuels assessed as alternatives.
- NOx and NO2 from gas engines, DG sets and furnaces, using the conversion options explained in our NO2 modelling guide.
- Road and highway projects, logistics parks and warehousing along the expressways around NCR.
- Waste processing and waste-to-energy facilities serving the large urban population.
How DSTechnoverse Can Help in Delhi NCR
We work remotely from Indore, Madhya Pradesh, for projects across Delhi, Haryana and Uttar Pradesh. Site data, drawings and baseline monitoring are shared online and review meetings are held by video call. EIA consultancies based in NCR use us as a white-label modelling team: we deliver the study in their format and they keep the client. Each study includes the model setup, source and receptor details, meteorological processing, isopleth maps, tables of maximum incremental and cumulative concentrations against the NAAQS, and report-ready text for the EIA or consent application.
Firms that want to run their own studies can request a free demo of AERMOD Studio, our browser-based AERMOD software, or ask about a personalised version for your firm. To discuss an NCR project, contact us with the site location, sources and the application you are preparing.
Frequently Asked Questions
Do you take AERMOD studies for projects in Delhi NCR even though you are in Indore?
Yes. All our modelling work is done remotely. Clients in Delhi, Gurugram, Noida, Faridabad, Ghaziabad and Sonipat share site layouts, source details and baseline monitoring data online, and we hold review calls by video. Site visits are rarely needed for the modelling itself, because the monitoring and site survey are normally carried out by the local EIA consultant or laboratory.
Which meteorological station is used for a study in Delhi NCR?
Indira Gandhi International Airport at Palam and the IMD observatory at Safdarjung are the main long-term surface stations for Delhi. For sites in Gurugram, Noida, Faridabad or Ghaziabad we compare these against site-specific monitoring from the baseline season and use whichever best represents local conditions, documenting the choice in the report so the appraisal committee can follow it.
Does DPCC, HSPCB or UPPCB ask for dispersion modelling for CTE?
Modelling is commonly required through EIA Terms of Reference and for larger or red category units, expansions that add emissions and stack height justifications. Consent conditions differ between the Delhi Pollution Control Committee, the Haryana State Pollution Control Board and the Uttar Pradesh Pollution Control Board, and between regional offices, so confirm the requirement with the office handling your application before the study is finalised.
How do you present results when background PM2.5 already exceeds the NAAQS?
We report the measured baseline, the predicted project increment and the total side by side, without hiding the exceedance. The increment is then expressed as a share of the standard and the background, with its location and the mitigation proposed. This honest presentation is what appraisal committees expect in NCR, where many monitoring locations exceed PM standards in winter regardless of the project.
Do GRAP restrictions change how DG sets are modelled?
They affect the scenarios. CAQM directions regulate DG set use in NCR and GRAP stages restrict their operation, generally to emergency and essential services at higher stages. We model the DG sets with the emission controls and fuel actually proposed, usually as standby operation at full load, and describe the GRAP context so the operating assumptions are clear to the reviewer.
Is a real estate project in Gurugram or Noida required to model air quality?
Building and construction projects with 20,000 to 1,50,000 m² built-up area need environmental clearance under item 8(a) of the EIA Notification 2006, and larger townships fall under 8(b). The air quality section usually covers DG sets during operation and construction dust. Many SEIAAs and SEACs expect dispersion modelling to support this, especially for large DG capacity.
Are Ghaziabad, Noida and Faridabad critically polluted areas?
They were identified as critically polluted areas in the CPCB CEPI assessment of 2009-10, along with the Najafgarh drain basin in Delhi. CEPI status has been reassessed since and conditions for new projects have changed over time, so we check the current position for each site and reflect it in the cumulative assessment and the way results are presented.
Why are winter results often the worst in NCR studies?
Winter nights in NCR bring light winds and strong surface inversions that keep emissions close to the ground. Low-level sources such as DG sets, construction equipment and short stacks can then give their highest 24-hour concentrations. Using a full year of meteorology, rather than a single season, makes sure these conditions are captured in the predicted maxima.
Can you work as a white-label partner for an NCR EIA consultancy?
Yes. We prepare the modelling and the air quality chapter text in your report format, under your name, and deliver the model input and output files you need for the record. Your team keeps the client relationship and handles site work and monitoring, while we handle the AERMOD setup, runs, maps and tables.
Get a Quote on the First Reply
Send us these details and we can scope and quote without a back-and-forth:
- Site location in Delhi, Haryana or Uttar Pradesh, with layout and nearby sensitive receptors
- List of stacks, DG sets and fugitive sources with heights, diameters and fuel
- Baseline AAQ monitoring data for PM10, PM2.5, SO2 and NO2
- Applicable regulator (DPCC, HSPCB, UPPCB, SEIAA or MoEFCC) and the ToR or consent requirement
- Proposed emission controls, including DG set retrofits or gas-based options under CAQM directions
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