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Dear Earth Talk:What are the health effects of clumping cat litter on humans? Are there any negative side effects from breathing the actual litter? —Andy and Taeja Klukas, Maple Grove, MN

Clay-based cat litters contain crystalline silica, the main component in sand, rock and mineral ores. A possible health threat from clay-based litters is posed by silica dust, which can be kicked up and breathed in by both cats and humans.

We have a working prototype of the temporary shutoff sensor, designed to turn off the fan as cats approach the litter box entry. It's for those cat...

Activated carbon:

• Has a capacity for virtually any vapor contaminant. It will adsorb some of almost any vapor;
• Has a large capacity for organic molecules, especially solvents;
• Will adsorb and retain a wide variety of chemicals at the same time;
• Has an extremely large capacity to destroy ozone catalytically. Ozone is a major component of smog;Works well under a wide range of temperature and humidity conditions;
• Adsorbs odors and chemicals preferentially to moisture. It is not a desiccant and will release moisture to adsorb chemicals;
• Can be used as a carrier of one material to attract and hold or react with another material;
• Is inert and safe to handle and use; and
• Is available and affordable.