Ozone (O₃) concentration by country

Population-weighted average ozone (O₃) concentrations in parts per billion (ppb). Local concentrations of ozone are recorded and estimated at a 11x11km resolution. These values are subsequently weighted by population-density for calculation of nation-level average concentrations.

Countries reporting

184

Highest

116 ppb

Qatar

Lowest

25 ppb

Marshall Islands

Median

55 ppb

Years covered

1990–2015

Data points

1,309

What the numbers show

Ozone (O₃) concentration is currently reported for 184 countries. The highest value is 116 ppb in Qatar; the lowest is 25 ppb in Marshall Islands.

The median across all reporting countries is 55 ppb, and the mean is 55.61 ppb.

The gap between the highest and lowest reporting country is a factor of about 5.

Over the past decade 79 countries rose and 41 fell. The largest increase was in Micronesia (country) (up 83.3%), and the largest decrease in Portugal (down 6.9%).

Ozone (O₃) concentration: full country ranking

#	Country	Latest	Year	10-year change	Trend
1	Qatar	116 ppb	2015	up 4.5%	rising
2	Bahrain	107 ppb	2015	up 3.9%	rising
3	United Arab Emirates	102 ppb	2015	up 3.0%	rising
4	Angola	88 ppb	2015	up 6.0%	rising
5	Kuwait	83 ppb	2015	up 1.2%	rising
6	Myanmar	81 ppb	2015	up 15.7%	rising
7	Nepal	78 ppb	2015	up 13.0%	rising
7	Oman	78 ppb	2015	up 2.6%	rising
9	Central African Republic	77 ppb	2015	down 2.5%	flat
10	India	76 ppb	2015	up 11.8%	rising
11	Iraq	75 ppb	2015	up 1.4%	flat
12	Bangladesh	74 ppb	2015	up 12.1%	rising
12	Iran	74 ppb	2015	up 1.4%	rising
12	Italy	74 ppb	2015	down 3.9%	falling
15	Jordan	73 ppb	2015	unchanged	flat
16	Palestine	72 ppb	2015	down 1.4%	flat
16	Togo	72 ppb	2015	down 1.4%	flat
18	Benin	71 ppb	2015	down 1.4%	flat
18	Israel	71 ppb	2015	down 1.4%	flat
18	Lebanon	71 ppb	2015	down 1.4%	flat
21	Algeria	70 ppb	2015	up 1.4%	flat
21	Egypt	70 ppb	2015	unchanged	flat
21	North Korea	70 ppb	2015	up 6.1%	rising
21	Syria	70 ppb	2015	unchanged	flat
25	Bhutan	69 ppb	2015	up 13.1%	rising
25	Greece	69 ppb	2015	down 2.8%	flat
25	Pakistan	69 ppb	2015	up 6.2%	rising
25	Saudi Arabia	69 ppb	2015	up 3.0%	rising
25	Taiwan	69 ppb	2015	up 9.5%	rising
31	Albania	68 ppb	2015	down 1.4%	falling
31	Cyprus	68 ppb	2015	down 1.4%	flat
31	South Korea	68 ppb	2015	up 9.7%	flat
34	Cameroon	67 ppb	2015	unchanged	flat
34	Nigeria	67 ppb	2015	down 1.5%	flat
34	Tunisia	67 ppb	2015	unchanged	flat
34	Turkey	67 ppb	2015	unchanged	flat
34	United States	67 ppb	2015	down 2.9%	flat
39	Ghana	66 ppb	2015	down 1.5%	flat
39	North Macedonia	66 ppb	2015	down 1.5%	flat
41	Bulgaria	65 ppb	2015	unchanged	flat
41	China	65 ppb	2015	up 6.6%	rising
41	Croatia	65 ppb	2015	down 1.5%	falling
41	Kyrgyzstan	65 ppb	2015	up 1.6%	flat
45	Bosnia and Herzegovina	64 ppb	2015	down 3.0%	falling
45	Maldives	64 ppb	2015	up 14.3%	rising
45	Montenegro	64 ppb	2015	down 1.5%	falling
45	South Sudan	64 ppb	2015	down 1.5%	flat
45	Slovenia	64 ppb	2015	down 3.0%	falling
45	Tajikistan	64 ppb	2015	unchanged	flat
45	Zambia	64 ppb	2015	up 6.7%	rising
52	Afghanistan	63 ppb	2015	up 1.6%	flat
52	Democratic Republic of Congo	63 ppb	2015	unchanged	flat
52	Uzbekistan	63 ppb	2015	unchanged	flat
55	Armenia	62 ppb	2015	unchanged	flat
55	Bolivia	62 ppb	2015	up 14.8%	rising
55	Congo	62 ppb	2015	up 1.6%	flat
55	Laos	62 ppb	2015	up 14.8%	rising
59	Cote d'Ivoire	61 ppb	2015	unchanged	flat
59	Spain	61 ppb	2015	down 4.7%	falling
59	Hungary	61 ppb	2015	down 1.6%	flat
59	Japan	61 ppb	2015	up 3.4%	rising
59	Libya	61 ppb	2015	up 1.7%	flat
59	Namibia	61 ppb	2015	up 3.4%	rising
59	Serbia	61 ppb	2015	down 1.6%	flat
66	Guinea	60 ppb	2015	unchanged	flat
66	Slovakia	60 ppb	2015	down 1.6%	flat
66	Chad	60 ppb	2015	unchanged	flat
69	Andorra	59 ppb	2015	down 6.3%	falling
69	Austria	59 ppb	2015	down 1.7%	falling
69	Azerbaijan	59 ppb	2015	unchanged	flat
69	Botswana	59 ppb	2015	up 3.5%	rising
69	Switzerland	59 ppb	2015	down 3.3%	falling
69	Georgia	59 ppb	2015	unchanged	flat
69	Mexico	59 ppb	2015	down 4.8%	flat
69	Romania	59 ppb	2015	down 1.7%	falling
69	Thailand	59 ppb	2015	up 11.3%	rising
69	Turkmenistan	59 ppb	2015	up 1.7%	flat
79	Czechia	58 ppb	2015	unchanged	flat
79	Morocco	58 ppb	2015	down 1.7%	flat
79	Moldova	58 ppb	2015	unchanged	falling
79	Sierra Leone	58 ppb	2015	unchanged	flat
83	Canada	57 ppb	2015	unchanged	flat
83	France	57 ppb	2015	unchanged	flat
83	Guatemala	57 ppb	2015	down 1.7%	flat
83	Paraguay	57 ppb	2015	up 16.3%	rising
83	El Salvador	57 ppb	2015	up 1.8%	rising
83	Ukraine	57 ppb	2015	down 1.7%	falling
83	Zimbabwe	57 ppb	2015	up 5.6%	rising
90	Singapore	56 ppb	2015	up 12.0%	falling
90	Vietnam	56 ppb	2015	up 12.0%	rising
92	Germany	55 ppb	2015	down 1.8%	flat
92	Liberia	55 ppb	2015	unchanged	flat
92	Lesotho	55 ppb	2015	up 1.9%	rising
92	Poland	55 ppb	2015	down 1.8%	flat
92	Sao Tome and Principe	55 ppb	2015	up 1.9%	flat
97	Belgium	54 ppb	2015	up 3.8%	rising
97	Sri Lanka	54 ppb	2015	up 10.2%	rising
97	Portugal	54 ppb	2015	down 6.9%	falling
97	Yemen	54 ppb	2015	up 1.9%	rising
102	Burundi	53 ppb	2015	unchanged	flat
102	Brazil	53 ppb	2015	up 15.2%	rising
102	Equatorial Guinea	53 ppb	2015	unchanged	flat
102	Malawi	53 ppb	2015	up 6.0%	rising
102	Netherlands	53 ppb	2015	up 3.9%	rising
102	South Africa	53 ppb	2015	up 1.9%	rising
108	Burkina Faso	52 ppb	2015	unchanged	flat
108	Guinea-Bissau	52 ppb	2015	unchanged	flat
108	Kazakhstan	52 ppb	2015	unchanged	flat
108	Niger	52 ppb	2015	unchanged	flat
108	Rwanda	52 ppb	2015	unchanged	flat
113	Belarus	51 ppb	2015	unchanged	falling
113	Ethiopia	51 ppb	2015	down 1.9%	flat
113	Gabon	51 ppb	2015	unchanged	flat
113	Lithuania	51 ppb	2015	unchanged	falling
113	Sudan	51 ppb	2015	unchanged	flat
113	Eswatini	51 ppb	2015	up 4.1%	rising
113	Uganda	51 ppb	2015	unchanged	flat
120	Denmark	50 ppb	2015	unchanged	flat
120	Cambodia	50 ppb	2015	up 11.1%	rising
120	Mali	50 ppb	2015	unchanged	flat
123	Bahamas	49 ppb	2015	down 2.0%	flat
123	United Kingdom	49 ppb	2015	up 4.3%	rising
123	Latvia	49 ppb	2015	unchanged	falling
123	Mongolia	49 ppb	2015	unchanged	flat
127	Colombia	48 ppb	2015	up 11.6%	rising
127	Cuba	48 ppb	2015	down 2.0%	flat
127	Djibouti	48 ppb	2015	up 2.1%	flat
127	Estonia	48 ppb	2015	unchanged	falling
127	Mozambique	48 ppb	2015	up 4.3%	rising
127	Malaysia	48 ppb	2015	up 6.7%	flat
127	Russia	48 ppb	2015	unchanged	flat
127	Venezuela	48 ppb	2015	up 11.6%	rising
136	Eritrea	47 ppb	2015	unchanged	flat
136	Haiti	47 ppb	2015	unchanged	flat
136	Tanzania	47 ppb	2015	up 2.2%	flat
139	Belize	46 ppb	2015	unchanged	flat
139	Finland	46 ppb	2015	down 2.1%	flat
139	Gambia	46 ppb	2015	unchanged	flat
139	Sweden	46 ppb	2015	unchanged	flat
143	Dominican Republic	45 ppb	2015	unchanged	flat
143	Honduras	45 ppb	2015	unchanged	flat
143	Iceland	45 ppb	2015	unchanged	flat
143	Norway	45 ppb	2015	down 2.2%	flat
143	Peru	45 ppb	2015	up 9.8%	rising
143	Senegal	45 ppb	2015	unchanged	flat
149	Indonesia	44 ppb	2015	up 7.3%	falling
149	Jamaica	44 ppb	2015	unchanged	flat
149	Mauritania	44 ppb	2015	unchanged	flat
152	Chile	43 ppb	2015	down 2.3%	falling
152	Cape Verde	43 ppb	2015	down 2.3%	flat
152	Panama	43 ppb	2015	up 4.9%	rising
155	Comoros	42 ppb	2015	up 2.4%	rising
155	Kenya	42 ppb	2015	unchanged	flat
157	Antigua and Barbuda	41 ppb	2015	unchanged	flat
157	Costa Rica	41 ppb	2015	up 2.5%	rising
157	Dominica	41 ppb	2015	up 2.5%	flat
157	Ecuador	41 ppb	2015	up 13.9%	rising
157	Nicaragua	41 ppb	2015	unchanged	flat
162	Argentina	40 ppb	2015	up 5.3%	rising
162	Brunei	40 ppb	2015	up 8.1%	flat
162	Saint Lucia	40 ppb	2015	unchanged	flat
162	Madagascar	40 ppb	2015	up 2.6%	flat
162	Mauritius	40 ppb	2015	up 2.6%	rising
162	Philippines	40 ppb	2015	up 2.6%	flat
162	Somalia	40 ppb	2015	unchanged	flat
169	Barbados	39 ppb	2015	unchanged	flat
169	Grenada	39 ppb	2015	up 2.6%	flat
169	Tonga	39 ppb	2015	up 2.6%	flat
169	Trinidad and Tobago	39 ppb	2015	unchanged	flat
169	Saint Vincent and the Grenadines	39 ppb	2015	unchanged	flat
174	Uruguay	38 ppb	2015	up 5.6%	rising
175	Vanuatu	37 ppb	2015	up 2.8%	flat
176	Australia	36 ppb	2015	unchanged	flat
176	Fiji	36 ppb	2015	up 2.9%	flat
178	New Zealand	35 ppb	2015	unchanged	flat
179	Greenland	34 ppb	2015	up 3.0%	rising
179	Suriname	34 ppb	2015	up 3.0%	flat
179	Seychelles	34 ppb	2015	up 3.0%	flat
182	Micronesia (country)	33 ppb	2015	up 83.3%	volatile
183	Guyana	32 ppb	2015	unchanged	flat
184	Samoa	31 ppb	2015	unchanged	flat
185	Papua New Guinea	29 ppb	2015	up 3.6%	falling
186	Solomon Islands	28 ppb	2015	up 3.7%	rising
187	Marshall Islands	25 ppb	2015	unchanged	flat

About this data

Indicator: Ozone (O₃) concentration
Unit: ppb
Source: Health Effects Institute (2017) – processed by Our World in Data
Licence: CC BY 4.0 (Our World in Data)
Coverage: 187 places, 1,309 data points, 1990–2015
Last refreshed: 07 August 2026