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>> you try to be happy you know? your life is hard. and with this problem, its more. rorlt of. >> reporter: health experts say long-term exposure to diseaseul exhaust can worsen asthma, lead to lung disease, and increase cancer risk. imelda ulloas husband now has asthma. he was at the doctor when we visited. >> his doctor said it was because of the pollution. >> reporter: omar ulloa is worried about his dad. >> to see him struggling just to even get a breath of air is heartbreaking and... its a ...