Ozone levels are highest on sunny days with atmospheric temperature inversions. You may be able to protect yourself somewhat by getting lots of antioxidants in your foods and supplements. Ozone levels tend to be highest a bit downwind of urban centers, partly because the emissions mixture needs time to cook in the sunlight, and partly because nitric oxide (NO) emissions from cars scrub ozone out of the air, through the reaction: NO + O3 ==> NO2 + O2.
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069