NEW DELHI, March 10 (Reuters) - India's auto trade body has lowered the growth estimate for passenger vehicle sales in the next fiscal year to 11 percent from an earlier forecast of 12 percent, after the government raised taxes on car sales last month. In his annual federal budget, Finance Minister Arun Jaitley imposed a sales levy of up to 4 percent on new passenger vehicles aimed at helping fight air pollution and congestion, and a 1 percent luxury tax on cars priced higher than 1 million rupees ($14,916). The higher taxes will be a dampener for passenger vehicle sales and there may be a retardation in growth, Sugato Sen, deputy director general at Society of Indian Automobile Manufacturers (SIAM), told reporters on Thursday.