Experts disagree on the amount of sulfur dioxide that will be emitted by the oil refinery being built near the Taj Mahal in Agra, India. Despite the builders' plans to use low-sulfur oil and gas, recycle sulfur in emissions, build higher emission stacks, and monitor sulfur dioxide levels on the ground, skeptics fear the controls may not be enforced and that even the proposed levels of sulfur dioxide (up to 22 mg/m₃) may damage the marble building. -- AATA