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One of these contaminants , nitrogen dioxidecreatessmog in the air
One issue raised ... factories and automobile engines around Beijingcausessmog in the air
still air conditions and pollutioncreatesmog 09:51
Catania failedto preventemissions tests on animals
Delhi air pollutioncausingsmog in LahoreDelhi
the planescreatesmog in the air
mixing togetherto createsmog out there
the mind - blowing fuel efficiency associated with this vehicle ... the emissionscausesmog in the air
the road ... emissionscausesmog in the air
a thin , faint layer of haze created by photochemical reactions ( that is , reactions involving sunlight ) similar to thosecausesmog on Earth
enough enginesto causesmog in the air
todayis causingtoday
some people to have difficulty breathingdoes causesome people to have difficulty breathing
currentlyis leadingcurrently
difficulty breathing and aggravate asthma , especially in childrencan causedifficulty breathing and aggravate asthma , especially in children
deathscausesdeaths
some flights delay this morningcausesome flights delay this morning
the growth of a special industryhas sparkedthe growth of a special industry
to jump in sales of face masks - Jan 15 , 2013leadsto jump in sales of face masks - Jan 15 , 2013
units effected to have a 20 % miss chance of itcausesunits effected to have a 20 % miss chance of it
the scale of disruption(passive) caused bythe scale of disruption