Cov pa lom thiab tsim kev puas tsuaj nyob hauv lub qhov av yog qhov chaw txaus ntshai ntawm kev tsim kho, thiab cov xwm txheej kev nyab xeeb loj tuaj yeem yooj yim tshwm sim yog tias kev tsim kho tsis raug. Cov pa roj uas muaj nyob hauv cov kev tsim kho kev tsim kho muaj ntau ntau xws li methane, carbon monoxide, carbon dioxide, hydrogen sulfide, nitrogen, sib txawv ntawm cov pa roj ntau heev, thiab cov roj tsis tshua muaj taug.
Lub hauv paus tseem ceeb ntawm cov pa taws hauv cov hauv av yog cov pa methane (CH4) thiab qee cov hloov pauv tsis haum cov organic (VOC). Cov kev phom sij tseem ceeb yog cov khoom tawg los ntawm kev sib txuas nrog cov pa roj, uas ua kev hem thawj rau kev nyab xeeb ntawm tus kheej ntawm kev tsim kho lub qhov.
Tab sis kev tawg ntawm cov pa taws yuav tsum muaj qee yam kev mob. Ib qhov nqi ntawm cov roj sib kis tau, cov pa oxygen txaus thiab lub qhov cub hluav taws, peb qho xwm txheej saum toj no yog qhov tseem ceeb. Feem ntau, cov pa roj ntawm qhov cov pa hluav taws tawg tau hu ua qhov tawg qis tshaj plaws, uas feem ntau hais tawm los ntawm LEL, yog li rau kev kuaj pom cov pa taws, nws cov LEL (qis tawg tawg) feem ntau pom.
Cov kuab lom nyob hauv lub qhov tau faib ua peb pawg: cov pa nkev, ua pa nkev, thiab pa lom cov pa organic (VOC) raws li lawv cov lus teb sib txawv rau tib neeg lub cev.
Thawj qeb: cov roj ntsha khaus tawm muaj xws li chlorine, phosgene, sulfur dioxide, nitrogen oxides, formaldehyde, ammonia, ozone thiab lwm yam roj cua. Cov yam ntxwv ntawm cov pa roj ua rau tib neeg lub cev yog qhov nws muaj lub zog txhawb cov tawv nqaij thiab cov leeg nqaij, muaj qee qhov kuj muaj cov nyhuv tsis muaj zog.
Qhov qeb ob: suffocating gases suav cov pa roj carbon monoxide, hydrogen sulfide, hydrogen cyanide, carbon dioxide, nitrogen, methane, ethane, ethylene, nitrobenzene vapor, hydrogen cyanide thiab lwm yam roj cua. Cov tebchaw no ua rau hypoxia hauv cov nqaij mos tom qab nkag mus rau hauv lub cev.
Qeb peb: cov tshuaj lom voos lom cov organic (VOC). Cov tshuaj lom neeg tsis huv txaus yuav tseem ua rau tib neeg lub ntsws ua pa thiab cov hlab ntsha tsis zoo, thiab qee qhov tuaj yeem ua rau mob qog noj ntshav, xws li benzene. Txij li feem ntau cov organic sib txuas yog cov khoom siv tau yooj yim, kev kuaj pom ntawm cov organic sib txuas siv feem ntau ua rau tawg, tab sis qhov tsawg kawg ntawm cov khoom sib txuas ntawm cov organic yog qhov ntau dua nws cov MAC (qhov siab tshaj plaws pub nyob hauv qhov chaw) tus nqi. Hauv lwm lo lus, nws yog qhov tsim nyog thiab tsim nyog los kuaj cov tshuaj lom ntawm cov organic sib txuas. Xws li n-hexane, methylene chloride, thiab lwm yam Txawm li cas los xij, feem ntau nws yog tus nqi thaum qhov kub siab ntawm qhov qis tawg qhov txwv (LEL) ntawm cov pa roj tsis tau mus txog. Nws lub cev lom tau dhau los ua kom muaj kev puas tsuaj rau tib neeg lub cev, yog li rau kev kuaj pom cov organic sib txuas (VOC), peb yuav tsum xub tshawb pom qhov tshuaj lom thiab tom qab ntawd tawg.
