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The UK standards for schools say that carbon dioxide levels of 800 ppm or lower indicate that the room is well-ventilated. [92] Regulations and standards from around the world show that CO 2 levels below 1000 ppm represent good IAQ, between 1000 and 1500 ppm represent moderate IAQ and greater than 1500 ppm represent poor IAQ. [88]
There are nevertheless a number of definitions of zero carbon housing, particularly concerning the scope of emissions in the housing lifecycle (eg construction vs operation or refurb), and whether it is acceptable to count off-site emissions reduction (eg due to renewable energy export) or other external reductions against any residual emissions from the house to make it a Net Zero Home.
In its language, the bill specifically identifies carbon dioxide and other greenhouse gases earlier defined by the EPA as regulated pollutants under the EPA's remit. The bill also gives the EPA more than $27 billion in funding for regulation under the CAA, through a green bank for carbon dioxide and direct grants for methane. [11] [12] [13] [14]
Michigan Governor Gretchen Whitmer on Wednesday signed an executive directive setting a goal for the midwestern state to become carbon neutral by 2050, the ninth U.S. state to take on this target.
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A recent study of 163 households in two rural Chinese counties reported geometric mean indoor PM 2.5 concentrations of 276 μg/m 3 (combinations of different plant materials, including wood, tobacco stems, and corncobs), 327 μg/m 3 (wood), 144 μg/m 3 (smoky coal), and 96 μg/m 3 (smokeless coal) for homes using a variety of different fuel ...
Over the past 800,000 years, [36] ice core data shows that carbon dioxide has varied from values as low as 180 ppm to the pre-industrial level of 270 ppm. [37] Paleoclimatologists consider variations in carbon dioxide concentration to be a fundamental factor influencing climate variations over this time scale.
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