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Percentage Contribution of Particulate Matter (PM₁₀, PM₂.₅) and Gaseous Pollutants (TSP,NOₓ, SO₂, VOCs) in Palestine    (2015–2022)
Year	(PM2.5)(µg/m³)	(PM10)(µg/m³)	TSP (%)	NOₓ (%)	SO₂ (%)	VOC (%)
2010	29.4	45.2	..	..	..	..
2011	28.8	44.3	..	..	..	..
2012	29.5	45.4	..	..	..	..
2013	29.8	45.8	..	..	..	..
2014	30.1	46.3	..	..	..	..
2015	30.5	46.9	2.57	11.31	0.64	85.47
2016	30.3	46.6	2.46	11.33	0.64	85.57
2017	29.8	45.8	2.33	11.34	0.64	85.68
2018	30.5	46.9	2.3	11.35	0.64	85.71
2019	30.8	47.4	2.23	11.35	0.64	85.77
2020	30.9	47.5	2.15	11.36	0.65	85.84
2021	31.1	47.8	2.08	11.37	0.65	85.9
2022	31.3	48.2	2.02	11.38	0.65	85.95
Source: UNSD Data Base, WHO Data Base,Applied Research Institute ARIJ, UNEP, 2018. Air Pollution and Health in the MENA Region,World Bank, 2020. Blue Skies, Blue Seas Report
Definition:(PM2.5): The mean annual concentration of fine suspended particles of less than 2.5 microns in diameters (PM2.5) is a common measure of air pollution. The mean is a population-weighted average for urban population in a country, and is expressed in micrograms per cubic meter [µg/m3].
(PM10): The mean annual concentration of fine suspended particles of less than 10 microns in diameters (PM10) is a common measure of air pollution. The mean is a population-weighted average for urban population in a country, and is expressed in micrograms per cubic meter [µg/m3].
TSP :Total Suspended Particulates, Finely divided solids or liquids that may be dispersed through the air from combustion processes, industrial activities or natural sources.
Noₓ:Nitrogen Oxides, A group of highly reactive gases that contain nitrogen and oxygen in varying amounts . Many of the nitrogen oxides are colorless and odorless .The common pollutant nitrogen dioxide (NO2) can often be seen combined with particles in the air as a reddish -brown layer over many urban areas. Nitrogen oxides are formed when the oxygen and nitrogen in the air react with each other during combustion . The formation of nitrogen oxides is favored by high temperatures and excess oxygen (more than is needed to burn the fuel ). The primary sources of nitrogen oxides are motor vehicles , electric utilities , and other industrial , commercial, and residential sources that burn fuels.
SO₂:Sulfur Dioxide, Heavy, pungent, colorless gas formed primarily by the combustion of fossil fuels. It is harmful to human beings and vegetation, and contributes to the acidity in precipitation.
VOC:Volatile Organic Compounds : Organic compounds that evaporate readily and contribute to air pollution mainly through theproduction of photochemical oxidants.
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