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At the same time it is also recommends that people think about fixing their homes for radon levels between 2 pCi/L and 4 pCi/L. [98] In the United Kingdom the ideal is presence of radon indoors is 100 Bq/m-3. Action needs to be taken in homes with 200 Bq/m −3 or more. [99]
Section 202(a)(1) of the Clean Air Act requires the Administrator of the EPA to establish standards "applicable to the emission of any air pollutant from…new motor vehicles or new motor vehicle engines, which in [her] judgment cause, or contribute to, air pollution which may reasonably be anticipated to endanger public health or welfare" (emphasis added). [3]
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.
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In October 2023 the average level of CO 2 in Earth's atmosphere, adjusted for seasonal variation, was 422.17 parts per million by volume (ppm). [13] Figures are published monthly by the National Oceanic & Atmospheric Administration (NOAA). [14] [15] The value had been about 280 ppm during the 10,000 years up to the mid-18th century. [2] [3] [4]
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 ...
An emission intensity (also carbon intensity or C.I.) is the emission rate of a given pollutant relative to the intensity of a specific activity, or an industrial production process; for example grams of carbon dioxide released per megajoule of energy produced, or the ratio of greenhouse gas emissions produced to gross domestic product (GDP).