I never take anything for malaria when it comes to Delhi, Agra, Jaipur. And I would advise the same for family and friends coming to those parts of India -- especially if they are staying at decent places.

Malaria is far less of a concern in these northern Indian cities than more routine illnesses caught from eating/drinking improperly and not washing your hands properly.

Insect repellant is more than plenty of prevention for the Golden Triangle-area tours.

And yes, the CDC seems to believe that BOM and DEL both have malaria issues. They do at certain times of the year, but those are for people living in a slum or near a body of stagnant water. In a nice place in DEL with some insect repellant, then I'd not worry a bit.