Don't push yourself too hard in extreme weather, and wear proper clothing Do not put yourself in a potentially hazardous situation unless there is someone else around to help, or get help, if you get in trouble. In particular, be very careful before going on a roof or into an attic or crawl space if you are by yourself. If lead paint or asbestos removal is going on, don't enter the premises without protective clothing and an approved respirator. Lots and Grounds Top Watch out for poison ivy, pyracantha, thorny bushes, snakes, bees, black widow and brown recluse spiders. Obstacles can lie concealed under a snow cover.
Pool chemicals can be hazardous.
Beware of buried tanks and manholes. Carbon monoxide can collect in them. You cannot smell it, and it could cause serious damage. Do not, under any circumstances, enter such a suspect space unless somebody else is standing guard over you, and has a way to get you out if you collapse. Don't go into a trench that is more than waist deep unless it is shored.