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In December 2007, the SPM level was 559 mg/metre cube, while in November this year it was 536 mg/metre cube. The RSPM level was also substantially lower this year—in December last year it was 313 mg/metre cube, while this year in November it was 247 mg/metre cube. The switch to CNG seems to have worked.
However, the level of Carbon Monoxide (CO) has gone up to 1,181 mg/metre cube in November from 900 mg/metre cube last year—Pahar Ganj registered the highest level.


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