Comprehension: In the following passage some words have been deleted. Fill in the blanks with the help of the alternatives given. Select the most appropriate option for each blank.
Increasing levels of air pollution are (1)______ for a higher incidence of respiratory diseases and other illnesses. Various studies carried out in Delhi reflect the correlation between air pollution and its (2)______ impacts. To tackle the problem of air pollution, a number of measures have been taken in the past, such as switching to (3)______ fuels, tightening vehicular emission limits, phasing out of old vehicles and maintenance of in-use vehicles, closing or relocating (4)______ industries, plantation activities, etc. However, a lot more still needs to be done if the capital desires to (5)______ clean air.