====== Explanation of Key Trends - Carbon Monoxide ======

===== Main drivers =====

**CO total emissions** show a falling trend over the whole interval, with emission **reductions of 80.6 %** between 1990 and 2021 and a renewed interval of emission reductions in the last years. 

The Main Driver for CO emissions is **Fuel Combustion (NFR 1.A)** with 90% of total 1990 emissions and an 86% reduction between 1990 and 2021. In the Fuel Combustion category, **Road Transport (NFR 1.A.3.b)** is responsible for 57% of the 1990 emissions, with **Passenger Cars (NFR 1.A.3.b.i)** emitting nearly all of it. Reductions of about 89% in those categories between 1990 and 2021 are mainly due to constantly improving fuels and increasingly stricter regulations resulting in technical improvements. 

**Other Sectors (NFR 1.A.4**, including commercial/institutional and residential sources) are responsible for about 27% of 1990 Fuel Combustion emissions with a 82% reduction between 1990 and 2021.

__Table: Carbon monoxide emissions 1990-2021, in kilotonnes [kt]__

^                                                                                                                                 |||||||||||||||^  Trend: latest compared to                                                                  ||
^  1990   ^  1995  ^  2000  ^  2005  ^  2010  ^  2011  ^  2012  ^  2013  ^  2014  ^  2015  ^  2016  ^  2017  ^  2018  ^  2019  ^  2020  ^  2021  ^  1990                                            ^  last years                               ^
|  13,319 |  7,217 |  5,130 |  3,853 |  3,529 |  3,448 |  3,198 |  3,161 |  2,993 |  3,094 |  2,969 |  2,976 |  2,859 |  2,754 |  2,451 |  2,586 |  {{:general:trends:down_green.png|down}} -80.6%  |  {{:general:trends:down_green.png|down}}  |

{{ :general:trends:iir_co_trend.png?direct&800 | trend of cO emissions, by sector}}
{{ :general:trends:iir_co_trend_from_2005.png?direct&800 | trend of cO emissions, by sector, from 2005}}