Table 3 International guideline values for some urban air pollutants as a time-weighted average concentration in air
European Union air quality
WHO air quality
standards
US air quality standards
Japanese air quality standards
Guidelines for Europe
Concentration Averaging
Concentration Averaging
Concentration Averaging
Concentration Averaging
Pollutant
g m\
time
g m\
time
g m\
time
g m\
time
SO
350
1 hour,
267
1 hour
267
1 hour
500
10 mins
99.7 percentile
125
24 hour,
107
24 hour
107
24 hour
125
24 hour
99 percentile
20
Annual
50
Annual
NO
200
1 hour,
200
1 hour
99.9 percentile
40
Annual
100
Annual
76—115
24 hour
40—50
Annual
O
160
1 hour
240
1 hour
120
1 hour
120
8 hour
160
8 hour
120
8 hours
Particulate
f
TSP
200
1 hour
200
1 hour
100
24 hour
100
24 hour
PM
50
24 hour,
150
24 hour
98 percentile
100
Annual
50
Annual
PM
50
24 hour
15
Annual
Proposed by the Commission.
Takes effect from 1 January, 2005.Takes effect from 1 January, 2010.
The guideline values should be read in the context of the guideline documents.
Proposed goal.
No guideline values were set for particulate matter because there is no evident threshold for effects on morbidity and mortality.
A Perspective on Global Air Pollution Problems
31