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

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

**CO total emissions** show a falling trend over the whole interval, with emission **reductions of 81.9 %** between 1990 and 2023 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 2023. 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 90% in those categories between 1990 and 2023 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 84% reduction between 1990 and 2023.

__Table: Carbon monoxide emissions 1990-2023, in kilotonnes [kt]__

^                                                                                                                                                 |||||||||||||||||^  Trend: latest compared to                   ||
^  1990   ^  1995  ^  2000  ^  2005  ^  2010  ^  2011  ^  2012  ^  2013  ^  2014  ^  2015  ^  2016  ^  2017  ^  2018  ^  2019  ^  2020  ^  2021  ^  2022  ^  2023  ^  1990                       ^  previous year  ^
|  13 321 |  7 188 |  5 097 |  3 790 |  3 590 |  3 462 |  3 364 |  3 349 |  3 134 |  3 177 |  3 050 |  3 030 |  2 927 |  2 839 |  2 479 |  2 607 | 2 568  |  2 409 |  -81.9%                     |  -6.2%          |

{{ :general:trends:iir_co_2025trend.png?direct&800 | trend of cO emissions, by sector}}
{{ :general:trends:iir_co_2025trend_from_2005.png?direct&800 | trend of cO emissions, by sector, from 2005}}