Compliance
MPCB Red, Orange, Green & White Categories Explained
How MPCB classifies industries as Red, Orange, Green or White, how to find your category, why it matters for consent, and common classification mistakes.
4 min read Aaradhya Enviro technical team
Quick answer
MPCB uses the CPCB Pollution Index to classify industries: Red (60 and above), Orange (41–59), Green (21–40) and White (up to 20). The category depends on your actual process and products; the most polluting activity generally decides it. White category units do not need consent; the others do.
Before you file anything with the Maharashtra Pollution Control Board (MPCB), you need to know one thing: your industry's category. Red, Orange, Green or White decides whether you need consent at all, how detailed your application must be, how often you will be inspected and how strict your monitoring conditions will be. Getting it wrong is one of the most common reasons consent applications are returned or delayed.
This guide explains how the categories work, how to find yours, and the mistakes we regularly see when industries in Chhatrapati Sambhajinagar and across Maharashtra classify themselves.
1. Where the categories come from
In 2016 the Central Pollution Control Board (CPCB) revised the way industrial sectors are classified across India. Each sector was given a Pollution Index (PI) score from 0 to 100, based on the emissions, effluent and hazardous waste it typically generates and the resources it consumes. State boards, including MPCB, use this classification when processing consents.
| Category | Pollution Index | What it means in practice |
|---|---|---|
| Red | 60 and above | Highly polluting. Detailed applications, frequent inspections, the strictest monitoring and often ZLD or online monitoring conditions. |
| Orange | 41 to 59 | Moderately polluting. Full consent required with regular monitoring and reporting. |
| Green | 21 to 40 | Low polluting. Consent required, generally with simpler conditions and longer validity. |
| White | Up to 20 | Practically non-polluting. No consent needed; units only inform the board. |
2. How to find your category
The lists are organised by activity, not by company name. Two units that both call themselves "chemical companies" can fall in different categories depending on what they actually make and how.
- List every activity on site. Main manufacturing process, utilities (boiler, DG set, thermic fluid heater), surface treatment, packaging, storage and any job work.
- Match each activity to the list. Look at the product, the process and the raw materials. Formulation and synthesis of the same product can be in different categories.
- Take the highest category. Where a unit carries out several activities, the most polluting one generally decides the category for the whole unit.
- Check capacity and expansion plans. An expansion, new product or new process can move you into a higher category and requires a consent amendment.
3. Typical examples
These examples are indicative only; the official list is the final word.
- Red: bulk drugs and pharmaceutical intermediates, dyes and dye intermediates, pesticides, tanneries, distilleries, sugar (excluding khandsari), cement, thermal power, electroplating and petrochemicals.
- Orange: many engineering, food-processing, servicing and assembly activities that generate some effluent or emissions but are not highly polluting.
- Green: low-impact manufacturing and processing with limited water use and minor emissions.
- White: a short list of practically non-polluting activities, such as certain simple assembly operations.
4. Why your category matters so much
- Consent route and documents: Red units need the most detailed project reports, treatment schemes and monitoring plans.
- Consent fee: MPCB consent fees are linked to your category and capital investment.
- Inspection frequency: Red units are inspected far more often than Green units.
- Special conditions: ZLD, online continuous monitoring, stack height and bank guarantees are most common in Red category consents.
- Siting restrictions: some locations and zones restrict Red category units.
5. Common mistakes we see
| Mistake | What happens | How to avoid it |
|---|---|---|
| Classifying by industry name instead of process | Application returned; wrong conditions in consent | Match each process step to the official list |
| Ignoring utilities like boilers and DG sets | Air consent conditions missing; stack non-compliance | Include every emission source in the application |
| Adding a product without amending consent | Unit operates outside its consent; notices and penalties | Check the category impact before any change |
| Assuming White means "no rules" | Waste, noise and other rules still apply | Keep basic environmental records even if exempt |
6. What to do next
Once your category is confirmed, the next step is the right consent: Consent to Establish before construction and Consent to Operate before production. Our guide on MPCB consent procedures (CTE/CTO) explains that process step by step. If you are unsure about your category, our MPCB consent team offers a free category check based on your process details.