By Neha Arora and Mayank Bhardwaj NEW DELHI (Reuters) – Favourable weather conditions led to a rare drop in pollution in India’s capital New Delhi, with residents last month breathing the cleanest air in at least four years but the authorities are warning that air quality is set to drop sharply in November. A delayed end to the monsoon, intermittent rains and a sharp pick-up in wind speeds ensured that the concentration of hazardous, small airborne particles known as PM2.5 in a cubic metre of air averaged 72 in October when air quality typically takes a turn for the worse. That was sharply dow…

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