Noise Limits and Working Hour Regulations
Six noise and working hour regulations applicable to e-waste recycling plants — industrial area noise limits by time period, maximum daily and weekly work hours under the Factories Act, continuous work limit before mandatory rest, and overtime wage rules.
| Rule | Limit |
|---|---|
| Industrial Area Noise — Daytime (6am–10pm) | 75 dB(A) Leq |
| Industrial Area Noise — Night-time (10pm–6am) | 70 dB(A) Leq |
| Daily Working Hours | Max 9 hours/day |
| Weekly Working Hours | Max 48 hours/week |
| Continuous Work Without Break | Max 5 hours |
| Overtime Pay | Paid at 2× wages |
Beyond definitions
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How to read this table
- Each row is one rule; the Limit column gives the specific standard or maximum value.
- Noise limits in dB(A) Leq are time-averaged equivalent levels — they are measured over a defined period (typically 1 hour) at the plant boundary, not at the equipment itself.
- Working hour limits are for each worker individually, not plant averages — a single worker being required to work more than 9 hours in a day is a violation, even if most workers are within limits.
About this table
E-waste recycling plants operate mechanical shredders, hammer mills, and granulators that generate significant noise — and employ workers in conditions that require compliance with the Factories Act 1948 working hour provisions. This table covers both the noise limits a plant must meet (to protect the surrounding community and plant workers) and the working hour limits (to protect plant employees).
Industrial Area Noise Limits under the National Ambient Air Quality Standards (NAAQS) for noise set maximum permissible noise levels at the plant boundary. Daytime limits (6 AM to 10 PM) are 75 dB(A) Leq — the equivalent continuous sound level over the measurement period. Night-time limits (10 PM to 6 AM) are 70 dB(A) Leq. E-waste shredders and hammer mills routinely exceed 85–95 dB(A) at the equipment itself — operators must install acoustic enclosures, machine guarding, and site boundary barriers to reduce ambient noise to within these limits at the plant perimeter. SPCB noise monitoring is typically required as part of the annual environmental statement. Workers near high-noise equipment must be provided with hearing protection under Factories Act requirements.
The Factories Act working hour provisions apply to all e-waste recycling plants with 10 or more workers. Maximum daily working hours are 9 per day (including lunch break) and weekly hours are 48 per week. Workers cannot be required to work more than 5 hours continuously without a rest interval of at least 30 minutes. Overtime is permitted but must be paid at twice the ordinary wage rate — unpaid overtime or systematic overtime without pay is a criminal offence under the Factories Act that can result in prosecution and factory license cancellation.
Key insights
- Industrial e-waste equipment noise (85–95 dB at the machine) exceeds ambient limits — acoustic enclosures or distance from the plant boundary are required to bring boundary noise within 75 dB(A) during daytime.
- SPCB consent conditions typically require annual noise monitoring reports as part of the environmental statement — this is a compliance obligation, not just a design exercise.
- Workers exposed to noise above 85 dB(A) must receive hearing protection under the Factories Act — documenting PPE provision and training is part of the factory license compliance.
- Overtime at 2× wages is a mandatory provision — management systems should track per-worker daily hours separately from plant throughput records to demonstrate compliance on labour inspection.
Methodology & sources
Noise limits are per the CPCB Noise Pollution (Regulation and Control) Rules 2000 and National Ambient Air Quality Standards. Working hour limits are per the Factories Act 1948. Both are subject to state-level implementation rules that may set tighter standards. Actual noise measurements at a specific site depend on plant design, equipment specifications, and site layout — a noise impact assessment by a qualified consultant is recommended during plant design.
Related data tables
Environmental Compliance Requirements
Five environmental compliance requirements for an e-waste recycling plant in India — Consent to Establish, Consent to Operate, e-waste authorization, hazardous waste management authorization, and EPR registration — all mandatory, each issued by SPCB or CPCB.
Green Belt Requirements by Location and Category
A four-location matrix of green belt requirements for industrial plants in India — showing required green belt as a percentage of plot area by location type (industrial estate, individual unit, air-polluting, critically polluted area) and pollution category (Red, Orange, Green).
Pollution Index Classification and Inspection Frequency
Four CPCB pollution index categories for industrial plants — Red, Orange, Green, and White — with the Pollution Index (PI) range that defines each category and the SPCB inspection frequency that applies.