Annex 7

(Art. 2 para. 5)

Ambient limit values for air pollutants

Pollutant	Ambient air limit value	Statistical definition
Sulphur dioxide (SO2)	30 µg/m3	Annual average (arithmetic mean)
	100 µg/m3	95 % of half-hour means for one year ≤ 100 µg/m3
	100 µg/m3	24-hour mean; must not be exceeded more than once per year
Nitrogen dioxide (NO2)	30 µg/m3	Annual average (arithmetic mean)
	100 µg/m3	95 % of half-hour means for one year ≤ 100 µg/m3
	80 µg/m3	24-hour mean; must not be exceeded more than once per year
Carbon monoxide (CO)	8 mg/m3	24-hour mean; must not be exceeded more than once per year
Ozone (O3)	100 µg/m3	98 % of half-hour means for one month ≤ 100 µg/m3
	120 µg/m3	1-hour mean; must not be exceeded more than once per year
Suspended particulates (PM10)1	20 µg/ma	Annual average (arithmetic mean)
	50 µg/m3	24-hour mean; must not be exceeded more than once per year
Suspended particulatesb (PM2.5)b	10 µg/m3	Annual average (arithmetic mean)
Lead (Pb) in PM10	500 ng /m3	Annual average (arithmetic mean)
Cadmium (Cd) in PM10	1.5 ng/m3	Annual average (arithmetic mean)
Total dust deposition	200 mg/m2× day	Annual average (arithmetic mean)
Lead (Pb) in dust fallout	100 µg/m2× day	Annual average (arithmetic mean)
Cadmium (Cd) in dust fallout	2 µg/m2× day	Annual average (arithmetic mean)
Zinc (Zn) in dust fallout	400 µg/m2× day	Annual average (arithmetic mean)
Thallium (Tl) in dust fallout	2 µg/m2× day	Annual average (arithmetic mean)
Notes: mg = milligram: 1 mg = 0.001 g µg = microgram: 1 µg = 0.001 mg ng = nanogram: 1 ng = 0.001 µg d = day The sign ≤ means «less than or equal to».