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By Michael M. Benarie

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In latitudinal s t r a t o s p h e r i c ozone c o n c e n t r a t i o n s and that stratospheric intru- s i o n s of ozone have been observed i n t h e f o l d i n g of t h e t r o p o p a u s e ( s e e Fig. t h e s e e f f e c t s do n o t seem t o p e n e t r a t e down below t h e t o p of 4), t h e mixed l a y e r i n t h e Mohave Valley. Another v e r y i n t e r e s t i n g f e a t u r e t o t h i s d a t a s e t i s shown i n Fig. 10. This p e r i o d of h i g h ozone l e v e l s r e s u l t e d from l o n g range t r a n s p o r t of ozone a n d / o r i t s p r e c u r s o r s i n t o t h e Mohave V a l l e y from t h e Los Angeles Basin.

A p o t e n t i a l l y i m p o r t a n t parameter t o t h e ozone c y c l e i s t h e c o n c e n t r a t i o n l e v e l of n i t r o g e n o x i d e s . T h i s measurement i s even more d i f f i c u l t t h a n t h a t f o r ozone In t h i s study the because of t h e p u r p o r t e d l y v e r y low r u r a l ppb l e v e l s of NO2. measured NO2 c o n c e n t r a t i o n s were made u s i n g a new Columbia S c i e n t i f i c I n d u s t r i e s Model 1600 chemiluminescent instrument. This analyzer can detect NO2 levels between 3 t o 5 ppb w i t h a n a c c u r a c y of 15 t o 20%.

Gilmore, Edeavour, 7(1971), pp. 107-14. B. ),Petro. Hand Book, 1st ed. McGraw. 3 8 T. Shivaji Rao, Proc. Indian. Environ. SOC. 23-24 Oct. 1978. 9 Air Ciual. Crit. S. , Health Education and Welfare, Nat. Contro1 Adm. P. 50. Groppe. Symp. , Apri 13-18, 1958. ll A . I . Vogel, Quant. , Long. , pp. 814-24. - 41 A I R M O N I T O R I N G NETWORK PROGFLUI I N SAUDI ARABIA T. M. Khan Water and Environment D i v i s i o n , The Research I n s t i t u t e U n i v e r s i t y of Petroleum and M i n e r a l s , Dhahran, Saudi A r a b i a ABSTRACT The Kingdom of Saudi A r a b i a h a s i n i t i a t e d a program t o i n s t a l l a i r q u a l i t y n e t work s t a t i o n s t h r o u g h o u t t h e c o u n t r y i n o r d e r t o measure c o n c e n t r a t i o n of t h e ambient a i r p o l l u t a n t s .

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