JOHANNESBURG AIR QUALITY DATA : ANNUAL AVERAGES IN PARTS PER MILLION (ppm)

Station

Year

Oxides of nitrogen

Nitrogen dioxide

Nitric oxide

Ozone

Carbon monoxide

Sulphur Dioxide

Non-methane Hydrocarbons

(urban)

1982*

0.054

0.023

0.047

0.008

0.438

1983*

0.042

0.022

0.027

0.015

0.755

0.296

1984*

0.055

0.022

0.032

0.018

0.419

0.223

1985*

0.053

0.023

0.026

0.021

0.565

0.300

1986

0.046

0.020

0.023

0.026

1987*

0.035

0.019

0.014

0.031

0.500

1988*

0.056

0.024

0.032

0.013

0.079

1989*

0.084

0.034

0.049

0.016

0.146

1990

0.058

0.022

0.035

0.018

0.291

1991

0.076

0.030

0.045

0.017

2.720

0.224

1992

0.075

0.029

0.046

0.017

2.620

0.179

1993

0.062

0.026

0.037

0.018

1.660

0.125

1994*

0.057

0.021

0.034

0.015

1.600

0.161

(urban)

1995

0.098

0.033

0.063

0.012

2.330

1996

0.082

0.028

0.053

0.013

2.510

0.189

(suburban)

1984*

0.120

0.100

0.020

0.037

0.491

1985

0.010

0.009

0.003

0.027

0.600

1986

0.011

0.009

0.003

0.016

1987*

0.010

0.009

0.003

0.018

1988

0.025

0.019

0.010

0.029

0.303

1989

0.014

0.009

0.005

0.031

0.186

1990

0.023

0.011

0.012

0.033

0.154

1991

0.016

0.011

0.005

0.031

0.083

1992

0.024

0.016

0.008

0.032

1993

0.031

1994

0.029

0.006

1995

0.012

0.027

0.006

1996

0.013

0.028

0.006

(urban)

1994

0.007

1995

0.021

0.008

1996

0.031

0.008

(urban)

1994

0.007

1995

0.014

0.007

1996

0.013

0.006

Industrial

1996*

0.024

1.160

(s-rural)

1985*

0.015

0.008

0.007

0.033

0.329

1986*

0.017

0.011

0.007

0.022

0.200

1987

0.023

0.010

0.015

0.011

0.237

1988*

0.022

0.008

0.015

0.018

0.262

1989*

0.024

0.013

0.012

0.015

0.283

(suburban)

1985*

0.030

1986*

0.019

1987*

0.017

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