1.   And with half its lines dead, the Municipal Railway deployed dozens of reserve diesel buses.

2.   And they say diesel buses can be made just as clean by using upgraded engines, new pollution control devices and low-sulfur fuel.

3.   But some transit operators, along with engine manufacturers and oil companies, lobbied to retain the option of buying new diesel buses.

4.   Environmentalists have assailed the TA for years for being unwilling to give up diesel buses, even long after other cities had done so.

5.   Even MBTA officials acknowledge that the diesel buses contribute to the high rate of asthma in Roxbury.

6.   For almost two years after the Supreme Court mandated the complete phaseout of diesel buses, Delhi continued licensing new diesel buses.

7.   In the last two years, MTA officials have made strides in reducing the number of highly pollutant diesel buses.

8.   --Increase the number of shuttle buses serving the valley, ultimately shifting from diesel buses to cleaner vehicles using propane or electric hybrid technology.

9.   It has recently been pushing Delhi to replace all its highly polluting diesel buses with ones that run on compressed natural gas.

10.   MTA also promised to speed up the retirement of older diesel buses.