Today I will map out an olfactory geography of my daily trajectory from Alexandria, on the rim of the airport industrial belt, to Ryde in the heart of the bordering-on-western suburbs. This is a trip of about 15 kilometres which takes approximately one hour, from the coffee-laden airs of Erskineville road to the fumes of the 506 as it squeaks and grumbles to a halt outside my office. The backstreets of the inner west give off their own affluent and slightly exotic aroma of jasmine and good living which fades to a mingling of Co2 with the clashing perfumes of the small flock of commuters waiting to cross Parramatta Rd in their straight skirts and spiky heels.

The Co2 persists, down Johnston Street in Annandale to the Balmain dockyards at the end where the City Westlink edges around the harbour. Here the odour depends on the time of day- a concentrated, powerful mingling of oil and mud at low tide, a saltier and more dilute version when the water is high. At the Darling Street intersection in Balmain, before the long rugged sweep down to the Iron Cove Bridge, there is a whiff of ammonia struggling with hospital grade disinfectant emitting from the public toilets (which are painted- appropriately- in a weak, well-hydrated yellow). Two petrol stations contribute their potent emissions to the mix as I swoop by.

The Iron Cove Bridge- more salt and, because of the exposure to the wind, a taste of distant bushfires or storms, depending on the time of day and year. On the other side I leave Victoria Rd and and cut through the backstreets of Drummoyne- more affluence, more commuter perfume, the more subtle fumes of expensive cars. The Gladesville Bridge is more impressive for its views than its odours, until - reaching the bottom end of the cycle path- there is a sudden sweet and overpowering waft of wattleflower.

And now downhill to Tarban Creek. Early in the morning the grass is still damp and smells of dew and at the very lowest point of my trip the path leads through the mangroves towards Gladesville and Hunters Hill. Here the odour is rich, organic, bordering on rotten but somehow still pleasant. The flowering shrubs and trees in the nature resrve on the other side of the creek balance it out with more honey and musk. This is the end of the trip, the last thing I smell before the steep climb where my own pungent sweat takes over and I am onto the final kilometre of my journey.