It is that time of the year.Time to look forward to misty mornings, early evenings, festivities, food, celebrations, holidays. And by the end of it, a littered cityscape, a dirtier river, and stubborn air pollution that will refuse to subside till the end of winter.Yes, it is that time of the year when along with ads on festival discounts, newspapers will soon be awash with public advisories on the ills of chemical laced idol immersions and bursting of crackers. Every year, this pitch falls on deaf ears.Hundreds of half melted chunks of Ganesha idols are still floating around in the Yamuna. Since last month, their noxious chemicals have made the polluted waters more poisonous. This week, the Durga Puja will culminate in hundreds of immersion into the Yamuna.The air will not be spared either. Last Diwali, fireworks fouled up Delhis air so much that it broke three years pollution record. The thick smog was compared to the worlds worst, leaving people gasping for breath for days on end.