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Table 6: Emission testing programme

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Site reference

Sample reference

Region

Process description

Size category (from survey)

Metal

Furnace

Pollution control

A

S1-S2

Otago

Iron and steel

Arc furnace

Fabric filter

Medium

B

S3

Auckland

Aluminium

Swarf drier

Fabric filter and afterburner

Large

S4

Aluminium

Gas-fired crucible

Fabric filter

S5

Aluminium

Gas-fired crucible

Fabric filter

C

S6-S7

Auckland

Iron/steel scrap

Induction

Fabric filter

Large

D

S8-S9

Auckland

Copper/bronze clean ingots

Electric induction batch

Fabric filter

Small

E

S10

Auckland

Aluminium internal and external scrap

Induction/remelt furnace

Fabric filter

Large

F

S11-S12

Auckland

Aluminium and copper (mixed)

Rotary/ reverberatory and induction

Fabric filter

Large

G

S13-S15

Otago

Steel

Induction

Fabric filter

Small-medium

H

S16-S19

Otago

Iron and steel (mixed)

Induction furnace

Fabric filter (not working)

Medium

I

S20

Waikato

Iron and steel

Induction

Fabric filter

Medium

S21

Manganese

Induction

Fabric filter

J

S22-S23

Taranaki

Aluminium (mixed)

Gas-fired crucible

Fabric filter

Large

K

S24-S25

Manawatu-Wanganui

Iron and steel

Electric induction

Fabric filter

Small-medium

La

S26-S27

Auckland

Iron and steel

Electric induction

None

Small

S28-S30

Bronze

Induction

None

a Samples were collected by concurrently running two high-volume samplers with PUF attachments. One unit was near the furnace (S26 and S28+S29) and one near casting (S27 and S30). S28+S29 was a gas-phase particle-phase split.