ANSWERS · 4 OCT 2026
What are the reporting thresholds for ammonia releases to air from an industrial facility under the EU Industrial Emissions Portal Regulation (E-PRTR), Canada's NPRI and the US Toxics Release Inventory (TRI)? Cite each threshold.
Only the EU sets a threshold on the ammonia actually released to air: 10,000 kg/year. Canada's NPRI and the US TRI trigger reporting on how much ammonia a facility manufactures, processes or otherwise uses. Once that threshold is met, the facility reports its air releases, however small.
| Regime | Ammonia threshold | What it measures | Facility-level conditions |
|---|---|---|---|
| EU, E-PRTR / Industrial Emissions Portal Regulation (EU) 2024/1244 | 10,000 kg/year to air; no water threshold listed | Annual release to air | None found in the sources I checked |
| Canada, NPRI (Ammonia (total), Part 1A) | 10 tonnes, at ≥1% by weight (no concentration limit for by-products) | Quantity manufactured, processed or otherwise used | Employees work ≥20,000 hours/year (some activities are exempt) |
| US, TRI (EPCRA section 313) | 25,000 lb manufactured or processed, or 10,000 lb otherwise used, per calendar year | Quantity manufactured, processed or otherwise used | Covered NAICS code and ≥10 full-time employee equivalents (20,000 hours) |
EU
- The Dutch RIVM list of E-PRTR pollutants gives ammonia (NH3, CAS 7664-41-7) a threshold for releases to air of 10,000 kg/year and none for water [1].
- A EUR-Lex search snippet gives the same 10,000 kg/year for ammonia in Annex II of Regulation (EU) 2024/1244, which replaces the E-PRTR. I didn't read the full Annex II text.
Canada (NPRI)
- "Total" means ammonia (NH3) plus ammonium ion (NH4+) in solution, expressed as ammonia.
- Some activities don't need to meet the 20,000-hour test, such as large wastewater systems and big pits or quarries.
- These points are from Environment and Climate Change Canada's reporting fact sheet and reporting guide.
US (TRI)
- These are the standard thresholds for listed chemicals.
- Ammonia has its own counting rule: anhydrous ammonia counts at 100% toward the threshold, but aqueous ammonia (from any source) counts at only 10% of the total ammonia present.
- These points are from EPA's TRI guidance and reporting materials.
In practice, a small emitter (well under 10 t/year to air) could fall outside the EU threshold and still have to report under NPRI or TRI if it uses enough ammonia.
Approach: I searched the Dutch E-PRTR list held in my datasets, which has the ammonia air threshold. The new EU Regulation, NPRI and TRI thresholds aren't in those datasets, so they come from search snippets of official EUR-Lex, Canada.ca and EPA pages.
Sources:
SOURCES · 1
- [1]Ammoniak (NH3) (e_prtr) · p.1RIVM
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