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2. 10 Signs Your Heater Isn’t Working as Well as It Could (and ...

   www.aol.com/lifestyle/10-signs-heater-isn-t...

   Turn it to the off setting and wait about 5 to 10 minutes for any excess gas to dissipate, then turn the switch to pilot to trigger the flow of gas. Hold the reset button or use a long match to ...

3. Do I need to worry about space heaters? Here’s what experts ...

   www.aol.com/lifestyle/worry-space-heaters...

   If your space heater is five or more years old, it's a good idea to check to make sure it has modern safety features like automatic shut-off if the device is tipped over or overheats, Lambert says ...

4. Air quality index - Wikipedia

   en.wikipedia.org/wiki/Air_quality_index

   An air quality index (AQI) is an indicator developed by government agencies [1] to communicate to the public how polluted the air currently is or how polluted it is forecast to become. [ 2 ] [ 3 ] As air pollution levels rise, so does the AQI, along with the associated public health risk.

5. Indoor air quality - Wikipedia

   en.wikipedia.org/wiki/Indoor_air_quality

   Since indoor air pollutants can adversely affect human health, it is important to have real-time indoor air quality assessment/monitoring system that can help not only in the improvement of indoor air quality but also help in detection of leaks, spills in a work environment and boost energy efficiency of buildings by providing real-time ...

6. Pilot light - Wikipedia

   en.wikipedia.org/wiki/Pilot_light

   In natural gas furnaces, water heaters, and room heating systems, a safety cut-off switch is normally included so that the gas supply to the pilot and heating system is shut off by an electrically operated valve if the pilot light goes out. This cut-off switch usually detects the pilot light in one of several ways: A flame rectification device. [2]

7. Own a pool in Southern California? New air-quality rule ...

   www.aol.com/news/own-pool-southern-california...

   The South Coast Air Quality Management District's governing board voted 9-1 to effectively phase out certain kinds of natural-gas-fired water-heating equipment in homes and businesses across its ...

8. Indicator bacteria - Wikipedia

   en.wikipedia.org/wiki/Indicator_bacteria

   Enterococci colonies growing on a selective agar after membrane filtration. Indicator bacteria can be cultured on media which are specifically formulated to allow the growth of the species of interest and inhibit growth of other organisms. Typically, environmental water samples are filtered through membranes with small pore sizes and then the ...

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