Thursday, March 25, 2021

Journal Article - Exploring NH3 behavior in urban and suburban Beijing

Infographic - What is AQI?

 
What AQI does is unification of all the complicated science of pollution composition, exposure rate based health severity, ambient standards, and measurement and standard protocols, into simple color coded bins for everyone to see how good or bad or ugly the pollution levels are and understand the necessary alertness. 
 
More such questions are answered in SIM-series # 46-2021 - 10 frequently asked questions on Air Quality Index (AQI)

Journal Article - Temporally resolved sectoral and regional contributions to air pollution in Beijing

Journal Article - A revised mineral dust emission scheme in GEOS-Chem: improvements in dust simulations over China

Journal Article - AtChem (version 1), an open-source box model for the Master Chemical Mechanism

Sunday, March 21, 2021

Infographic - What is the difference between fine and coarse particulate matter?

  

There is constant confusion between PM2.5 vs. PM10 and “fine vs. coarse” fractions of particulate matter. The schematic above presents an overview of what is part of each of these fractions and they are broadly defined like this

  • PM2.5 – this is all the particulate matter under 2.5 um
  • PM10 – this is all the particulate matter under 10.0 um
  • Fine PM – this is all the particulate matter under 2.5 um, which is same of PM2.5
  • Coarse PM – this is all the particulate matter between 2.5 and 10 um
More such questions are answered in SIM-series # 44-2021 - 10 frequently asked questions on particulate matter (PM) 

Journal Article - The future of coal-fired power generation in Southeast Asia

Journal Article - Ozone a persistent challenge to food security in India: Current status and policy implications

Journal Article - Implication of emission regulation on cost and tariffs of coal-based power plants in India

Wednesday, March 10, 2021

Journal Article - Promoting public transport as a strategy to reduce GHG emissions from private vehicles in Kuwait

Journal Article - Urban Transport Assessment of Emissions and Resource Demand of Climate Protection Scenarios

Journal Article - Measuring on-road vehicle emissions with remote sensing in Australia

Journal Article - The application of land use regression model to investigate spatiotemporal variations of PM2.5 in Guangzhou, China

Journal Article - Global impact of COVID-19 restrictions on the surface concentrations of nitrogen dioxide and ozone

Thursday, March 04, 2021

Infographic - What is the difference between primary and secondary particulate matter?

 

Primary is a direct emission source and forms a significant portion of the PM pollution, comprising of metals, elemental carbon (also known as black carbon), and organic carbon. Other primary pollutants include sulfur dioxide, nitrogen oxides, volatile hydrocarbons, methane, carbon monoxide, and carbon dioxide. 

Secondary is due to chemical transformation of primary gaseous emissions. In PM, the secondary aerosol components include sulfates from sulfur dioxide emissions, nitrates from nitrogen oxide emissions, organic aerosols from hydrocarbon emissions, and ammonium from ammonia emissions. The path and the quantity of chemical transformation depends on the strength of the pollutant emissions and the mix of the emissions. In an atmospheric chemical mechanism, these interlinkages can run into 300 equations. Other secondary pollutants include ozone – a result of a mix of reactions between nitrogen oxides and hydrocarbon emissions in the presence of sunlight. 

More such questions are answered in SIM-series # 44-2021 - 10 frequently asked questions on particulate matter (PM)