Fortunately for gracie, where I live is zoned agriculture.........plenty of woods and fields, my neighbors NEVER use chemicals on their lawns and we are organic gardeners
. I don't take gracie to friends houses that use pesticides on their lawn or ornamentals or gardens................I went thru a master gardener class thru the Cooperative Extension office (thru VA. Tech.)
and so I KNOW where danger lies in that regard........you can always check with your recreation and parks system to find out which areas are safe for pets out in the public.
As far as leaving gracie in a carrier in the car.........the upper temp must be 60 or lower, I leave the windows cracked, doors locked, and am never gone for more that a few minutes.............
Longer than that, or warmer than that Gracie stays at home.
My car windows are also UV protected
AND my vehicle has a very NASTY alarm system.............
I guess its all a matter of personal preference.........many people are not aware of all the toxicity in the public domain.