Table 1.
Sources of general air pollutants and phytotoxic air pollutants
a
Source
All major pollutants
Phytotoxic pollutants
Percent
Percent
Transportation
60
28
Industry
18
30
Generation of electricity
14
26
Space heating
5
9
Refuse disposal
3
7
↵
a
From
David and Gerhold (1976)
.