Simply put: Taiwan’s environmental regulations set clear numerical standards for factory dust emissions. The concentration of particulate matter in exhaust pipes must not exceed 100 mg/Nm³ (for new combustion sources, it’s even stricter at 50 mg/Nm³ ). Exceeding these limits results in fines, mandatory improvements, or even shutdown orders.
Many customers ask: “My dust doesn’t look that bad, it should be under the limit, right?” But in fact, dust concentration requires instrument testing; the naked eye cannot judge. Below is a detailed explanation of regulatory requirements, testing methods, and the consequences of violations.
1. Main Regulatory Basis
Taiwan’s main regulations for dust emission control are:
| Regulation Name | Authority | Description |
| Air Pollution Control Act | Ministry of Environment | Parent law governing basic principles and penalties for air pollution control |
| Standards for Air Pollutant Emission from Stationary Pollution Sources | Ministry of Environment | Specific numerical emission standards, the focus of this article |
| Regulations for Fuel Mixing Ratios and Composition Standards for Stationary Pollution Sources | Ministry of Environment | Standards related to fuel use |
| Types and Emission Limits of Hazardous Air Pollutants from Stationary Sources | Ministry of Environment | Control standards for specific hazardous substances |
2. Particulate Matter Emission Standards (The Most Critical Numbers)
According to the amendment announced on April 25, 2013, by the EPA (now Ministry of Environment), the standards for particulate matter emissions from stacks are as follows:
| Pollution Source Type | Stack Emission Standard | Notes |
| Combustion Process (New Sources) | 50 mg/Nm³ | Applicable to facilities established after April 25, 2013 |
| Combustion Process (Existing Sources) | 100 mg/Nm³ | Existing sources given a 1-year grace period for improvement |
| Non-Combustion Processes | 100 mg/Nm³ | Processes such as grinding, screening, conveying, etc. |
Note: The unit here is mg/Nm³ (milligrams per cubic meter of exhaust gas volume), where N stands for standard conditions of “273 Kelvin and 1 atmosphere”.
3. What is an “Existing Source”? What is a “New Source”?
| Category | Definition | Applicable Standard |
| Existing Source | Facilities completed, under construction, or with completed bidding/contracts before the April 25, 2013 amendment | 1-year grace period; old standards apply during grace period, new standards apply after |
| New Source | Facilities established after the April 25, 2013 amendment date | Directly subject to new standards (50 mg/Nm³ for combustion processes) |
In one sentence: Older factories have a grace period; new factories must meet strict standards from the start.
4. Testing Methods and Considerations
| Item | Description |
| Testing Method | Must be conducted by EPA-accredited testing agencies using national standard methods for sampling and analysis. |
| Correction Method | Oxygen concentration correction methods specified based on industry-specific air pollutant emission characteristics. |
| Opacity | After the June 14, 2023 amendment, opacity video smoke detection standards for stack particulate matter were added. This requires using a video smoke detection system for opacity determination and an illuminance meter to measure ambient light conditions. |
| Continuous Monitoring | Eligible stationary pollution sources must install continuous automatic monitoring facilities and connect to the competent authority. Daily measurements must comply with regulations. |
5. Consequences of Violations
According to the Air Pollution Control Act, penalties for exceeding emission standards are severe:
| Violation | Penalty |
| Exceeding Emission Standards | Fine of NT$100,000 to NT$20 million |
| Serious Violations | Order to improve within a time limit; failure to comply may result in suspension, shutdown, or revocation of operating permits |
| Continuous Violations | Daily cumulative fines until rectification |
| Causing Pollution Accidents | Responsible persons may face imprisonment (up to 1 year), detention, or concurrent fines |
In one sentence: Fines are just the beginning; shutdown is the real pain.
6. Frequently Asked Questions
Q: My factory doesn’t have a chimney; dust escapes through windows. Will I still be fined?
A: Yes. Any dust escaping from the factory boundary is considered “fugitive particulate matter” and is also regulated. Environmental authorities can test at the property line and issue fines if standards are exceeded.
Q: The emission standard is 100 mg/Nm³. How do I know if my equipment exceeds it?
A: You need to commission a qualified testing company to conduct actual sampling and testing at your emission stack. USONIC can assist in arranging testing and recommend improvement plans based on the results.
Q: I heard some industries have stricter standards?
A: Yes. In addition to general emission standards, the Ministry of Environment has established stricter “industry-specific emission standards” for certain sectors, such as:
- Waste incinerators (dioxins)
- Asphalt mixing plants
- Brick and tile kilns
- Lead and zinc industries
If you belong to a specific industry, it is recommended to confirm the applicable standards with the environmental authority.
7. What Can USONIC Do for You?
“Regulations will only get stricter. It’s better to prepare in advance than to panic when the fine arrives.”
USONIC provides:
- Regulatory Consultation: Helping you understand applicable emission standards
- Testing Arrangement: Introducing qualified testing agencies and assisting with emission testing
- Improvement Planning: If test results exceed standards, we provide 3D planning and equipment improvement solutions
- Permit Application Assistance: Helping prepare documents for operating permit applications
Our goal: Ensuring your equipment not only “runs” but is also “compliant.”
In one sentence:
“Dust emissions aren’t whatever you think—the law decides. 100 mg/Nm³ is the red line, and crossing it comes at a cost.