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  1. Last 7 days
    1. (d) All calculations shown in this appendix shall be implemented on a site-level basis. Site level concentration data shall be processed as follows: (1) The default dataset for PM2.5 mass concentrations for a site shall consist of the measured concentrations recorded from the designated primary monitor(s). All daily values produced by the primary monitor are considered part of the site record; this includes all creditable samples and all extra samples. (2) Data for the primary monitors shall be augmented as much as possible with data from collocated monitors. If a valid daily value is not produced by the primary monitor for a particular day (scheduled or otherwise), but a value is available from a collocated monitor, then that collocated value shall be considered part of the combined site data record. If more than one collocated daily value is available, the average of those valid collocated values shall be used as the daily value. The data record resulting from this procedure is referred to as the “combined site data record.”
      1. Calculate mean of all collocated NON-primary monitors' values per day
      2. Coalesce primary monitor value with this calculated mean
  2. Oct 2020
    1. 1.1. Monitors For the purposes of AQS, a monitor does not refer to a specific piece of equipment. Instead, it reflects that a given pollutant (or other parameter) is being measured at a given site. Identified by: The site (state + county + site number) where the monitor is located AND The pollutant code AND POC – Parameter Occurrence Code. Used to uniquely identify a monitor if there is more than one device measuring the same pollutant at the same site. For example monitor IDs are usually written in the following way: SS-CCC-NNNN-PPPPP-Q where SS is the State FIPS code, CCC is the County FIPS code, and NNNN is the Site Number within the county (leading zeroes are always included for these fields), PPPPP is the AQS 5-digit parameter code, and Q is the POC. For example: 01-089-0014-44201-2 is Alabama, Madison County, Site Number 14, ozone monitor, POC 2.

      How monitors (specific measures of specific criteria) are identified in AQS data.

  3. Aug 2020
  4. Jun 2020
  5. May 2020
  6. Sep 2018
    1. Tại Việt Nam, Tổ chức Y tế thế giới (WHO) coi ô nhiễm không khí là một trong những nguyên nhân gây ra gánh nặng bệnh tật và tử vong hàng đầu. Có khoảng 6/10 bệnh có tỷ lệ chết cao nhất tại Việt Nam là những bệnh liên quan đến không khí.
      
    2. Tuy nhiên, việc sử dụng khẩu trang chỉ là một giải pháp tình thế. Theo TS Hoàng Dương Tùng, để hạn chế ô nhiễm bụi PM2.5 cần hướng tới giải quyết tận gốc. Nguyên nhân gây ra ô nhiễm bụi mịn PM2.5 được xác định từ các nguồn sản xuất, giao thông, xây dựng, sinh hoạt... Trong đó bốn ngành gồm sắt thép, nhiệt điện, xi măng, hóa chất đã gây ra 80% lượng ô nhiễm từ các nguồn ô nhiễm điểm.

  7. May 2018
    1. Negative values included when assessing air quality In computing average pollutant concentrations, EPA includes recorded values that are below zero. EPA advised that this is consistent with NEPM AAQ procedures. Logically, however, the lowest possible value for air pollutant concentrations is zero. Either it is present, even if in very small amounts, or it is not. Negative values are an artefact of the measurement and recording process. Leaving negative values in the data introduces a negative bias, which potentially under represents actual concentrations of pollutants. We noted a considerable number of negative values recorded. For example, in 2016, negative values comprised 5.3 per cent of recorded hourly PM2.5 values, and 1.3 per cent of hourly PM10 values. When we excluded negative values from the calculation of one‐day averages, there were five more exceedance days for PM2.5 and one more for PM10 during 2016.
  8. May 2017
    1. Air Quality Standards Coalition

      This may be a front group. Investigate, find additional sources, and leave research notes in the comments.

    2. Air Quality Standards Coalition

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    3. Air Quality Standards Coalition

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    4. Air Quality Standards Coalition

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    1. Air Quality Standards Coalition

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    2. Air Quality Standards Coalition

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    3. Air Quality Standards Coalition

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    4. Air Quality Standards Coalition

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    1. Air Quality Standards Coalition

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    2. Air Quality Standards Coalition

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    3. Air Quality Standards Coalition

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    4. Air Quality Standards Coalition

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    1. Air Quality Standards Coalition

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    2. Air Quality Standards Coalition

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    3. Air Quality Standards Coalition

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    4. Air Quality Standards Coalition

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    5. Air Quality Standards Coalition

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    6. Air Quality Standards Coalition

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    7. Air Quality Standards Coalition

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    8. Air Quality Standards Coalition

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    1. Air Quality Standards Coalition

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    2. Air Quality Standards Coalition

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    3. Air Quality Standards Coalition

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    4. Air Quality Standards Coalition

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    5. Air Quality Standards Coalition

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    6. Air Quality Standards Coalition

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    7. Air Quality Standards Coalition

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    8. Air Quality Standards Coalition

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    1. Air Quality Standards Coalition

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    2. Air Quality Standards Coalition

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    3. Air Quality Standards Coalition

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    4. Air Quality Standards Coalition

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    5. Air Quality Standards Coalition

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    6. Air Quality Standards Coalition

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    7. Air Quality Standards Coalition

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    8. Air Quality Standards Coalition

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    1. Air Quality Standards Coalition

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    2. Air Quality Standards Coalition

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    3. Air Quality Standards Coalition

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    1. Air Quality Standards Coalition

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    2. Air Quality Standards Coalition

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    3. Air Quality Standards Coalition

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  9. Jan 2017
    1. China has slapped millions of dollars worth of fines on alleged offenders for violating anti-pollution rules, according to state media.

      Worth noting that another motivation for innovation is the growing repricusions of the externalities of legacy industries and companies. This is encouraging investment in sustainable solutions and opening the door for new way business who's costs are lower becuase their impact on the environment is lower.