The WHO (World Health Organization) recommended dust collection limits are as follows:

AMBIENT AIR

ODA 1

Ambient air that may temporarily contain pollution.

ODA 2

Ambient air with a high concentration of particles.

ODA 3

Ambient air with very high concentrations of particles.

INTAKE AIR

Recommendations for selecting supply air filters.

GENERAL VENTILATION

SUP 1

SUP 2

Permanently used rooms

For example: Kindergartens, schools, offices, hotels, houses, meeting and conference rooms, exhibition, theater, cinema and concert halls.

SUP 3

Temporarily used rooms

For example: Warehouses, shopping malls, laundries, server rooms.

SUP 4

Short-term rooms

For example: Warehouses, toilets, stairs.

SUP 5

Rarely used rooms

For example: Landfills, data centers, underground car parks.

 INDUSTRIAL VENTILATION

SUP 1

Rooms with high hygiene requirements

For example: Hospitals, pharmaceuticals, optics and electronics.

SUP 2

Rooms with medium hygiene requirements

For example: Food industry.

SUP 3

Rooms with normal hygiene requirements

For example: Premises in the food industry where there are no high standards of hygiene.

SUP 4

Rooms without hygiene requirements

For example: Car and repair shop premises.

SUP 5

Heavy industry production areas

For example: Steel mills, metal smelters and welders.

SUMMARY

AMBIENT AIR

INTAKE AIR

SUP1

PM2,5≤2,5
PM10≤5

SUP2

PM2,5≤5
PM10≤10

SUP3

PM2,5≤7,5
PM10≤15

SUP4

PM2,5≤10
PM10≤20

SUP5

PM2,5≤15
PM10≤30

Category

PM2,5

PM10

ePM1

ePM1

ePM2,5

ePM10

ePM10

ODA1

≤10

≤20

60%

50%

60%

60%

50%

ODA2

≤15

≤30

80%

70%

70%

80%

60%

ODA3

>15

>30

90%

80%

80%

90%

80%