Qaraxa Shenhai-Caddaynta
Budada asphalt waxay noqon kartaa qarax marka aad u fiican.
Sida walxaha aasaasiga ah ee asphalt, hydrocarbons udgoon polycyclic, marka si ku filan loo miiro, waxay u nugul yihiin inay samaysmaan boodh. Iyada oo ay ugu wacan tahay aagga sare ee ballaaran ee asphalt, si sahal ah ayay ula falgashaa hawada, si weyn u kordhinaysa khatarta qaraxyada boodhka ah.