- 3 Dust-measuring sets in outdoor operation:
  . 'Basic'-version with GP2Y10 for dust with BME280 for T&H&B
    has Annex with MiCS6814+LM35 for gas [CO, NH3, NO2, Temperature]
    Feb07, 2023, after cleanup read-out for GP2Y10 rescaled for indicative display.
  . 'Better'-version with SDS011 for dust with BME280 for T&H&B
    Dec22, 2022, after cleanup read-out restarted & testing, relocated.
  . 'Best' Dust-measuring set with SPS030/SHT31 outdoor testing & integrating.
    Oct02, 2023 initial start at location.

- SPS030 / SHT31+DHT22-sensor:
  . SPS030 sucks air from 'front-space' incl. heating [not yet active]
  . SPS030/SHT31 externally linked to Luftdaten.info and further to RIVM
  . SPS030/SHT31 internally linked to Domoticz, and to this website
  . SHT31-sensor is the Luftdaten-source of T&H-information
  . DHT22-sensor via separate ESP8266 measures housing conditions as reference
- the SDS011 / BME280+DHT22-sensor:
  . SDS011 sucks air from 'front-space' incl. heating [not yet active]
  . SDS011/BME280 externally linked to Luftdaten.info and further to RIVM
  . SDS011/BME280 internally linked to Domoticz, and to this website
  . BME280-sensor is the Luftdaten-source of T&H-information
  . DHT22-sensor via separate ESP8266 measures housing conditions as reference
- the GP2Y10 & MiCS6814 / BME280-sensor & LM35-sensor:
  . all internally linked to Domoticz, and in that way to this website
  . for GP2Y10 & MiCS6814 continuity & calibration is a problem
  . no clear explanation possible for information from GP2Y10 & MiCS6814
- the 'placeholder'-webpage  for gas-elements is provisional/test:
  . Ozon-info from DarkSky for higher (~stratospheric) levels
  . EUROPEAN AIR QUALITY - ENSEMBLE HOURLY FORECASTS AND ANALYSES
  . AQICN-info
  . RIVM-info