With the regional transport office (RTO) registering a 45%growth in vehicles between 2003-04 and the police still grappling to curb the menace of auto-rickshaws which use kerosene as fuel, pollution levels have shot up in the city. The Gujarat Pollution Control Board (GPCB) office has refused to divulge data about sulphur dioxide and carbon monoxide levels in the air. Rising pollution levels are making diseases like allergy and asthma and throat infectins common.