UK monthly NO2 concentration in select cities 2023

Concentrations of nitrogen dioxide (NO₂) in UK cities typically follow a similar pattern each year, with the highest levels normally observed in the winter months and the lowest in the summer months. An exception to this was in 2020, when several cities saw levels drop to lows in the spring, following the UK's first national COVID-19-related lockdowns and travel restrictions. NO₂ is mainly emitted by road transportation.

Average monthly concentration of nitrogen dioxide (NO₂) in selected cities in the United Kingdom from 2020 to 2023 (in micrograms per cubic meter)

Characteristic	Bristol	Cardiff	Edinburgh	Glasgow	Manchester	Leeds	Liverpool	London
Oct '23	20.3	17.4	15.5	18.7	22.9	18.6	18	24
Sep '23	21.7	18.1	14.9	18.6	20.5	18.6	18.1	25.1
Aug '23	14.8	11.9	15.8	17	16	12.8	10.6	16.8
Jul '23	11.1	8.9	13.2	11.7	14.8	12.4	9.4	14.8
Jun '23	14.8	12.7	9.7	14.2	16.1	14.5	12.7	18.8
May '23	16.2	13.5	13.2	17.9	17.3	16.3	12.3	18
Apr '23	22.7	19.7	16.3	22.5	21.1	19.5	17.8	21.8
Mar '23	20.3	16.8	18	27.4	21.2	21	18.6	22.2
Feb '23	26.5	22.3	18.4	25.5	29.2	24.5	22.4	31.3
Jan '23	28	24.2	20.8	29.6	30.2	23.1	22.1	29.7
Dec '22	31.9	26.4	25.7	40.3	35.8	30.1	31.1	31.2
Nov '22	25.9	21.1	20.1	28.4	27.1	28.6	21.5	25
Oct '22	20.2	15.7	12.9	20.6	24.6	22.4	16.8	24.1
Sep '22	22.7	15.9	15.3	24.1	20	21.7	16	23
Aug '22	20.1	14.3	12	19.7	18.2	16.3	12.5	19.4
Jul '22	15.1	11.2	13.2	15.5	17.5	15.1	12.1	18.5
Jun '22	18.6	11.5	11.9	15.3	17.6	15.8	13.1	18
May '22	18	11.5	13.3	16.5	19.3	17	11.8	20.1
Apr '22	25.7	18.3	18.1	22.9	23.6	19.7	16.3	23.9
Mar '22	32.1	26.7	27.4	34.8	28.9	33.2	24.6	32.9
Feb '22	19.4	13.4	19.2	23.8	21.7	21.4	14.6	22.3
Jan '22	33.7	30	25.5	27.4	36.8	27.4	25.5	37
Dec '21	26.4	23	30.2	32.5	35.1	30.4	26.5	25.7
Nov '21	28.5	25.9	25.4	30.4	31.7	25.6	21.9	28.5
Oct '21	22.6	16.2	19.5	26.6	21.7	23.5	15.6	25.2
Sep '21	23.6	16.1	19	25	22.6	23.6	18	25.4
Aug '21	18.7	13	18.5	22.2	17.3	17.6	12.7	19.5
Jul '21	19.2	12.8	15.7	18.7	18.3	18.8	12.3	22.1
Jun '21	16.5	12.6	22	17.7	16.2	15.4	12.8	21.1
May '21	19	13.9	27.8	26	21.5	21.6	15.2	22.9
Apr '21	28.7	20.5	26.9	30.1	24.3	22.4	19.9	28
Mar '21	25.9	21.5	26.7	23.7	23.3	19	17.4	28.4
Feb '21	24.5	22	13.4	24.2	22.4	26.4	22.4	28.5
Jan '21	26.5	23.6	30.8	43.5	34.9	27.4	26	29.9
Dec '20	29.9	26.2	29.2	37.5	31.8	29.9	25.7	31.2
Nov '20	28.3	23.7	25.3	28.7	29.2	28.8	23.6	31.4
Oct '20	21.1	15.7	23.4	26.9	23.7	24.9	17.8	23.6
Sep '20	22.2	16.3	22.8	23.1	21.9	20.2	16.2	25.6
Aug '20	18.9	11.9	12.1	19.3	15.3	15.1	14.3	21.8
Jul '20	10.5	7.2	15.3	15.3	17	13.1	11.1	17.5
Jun '20	14.1	9.8	8.2	12.5	12.9	14.2	13	20.3
May '20	11.1	11	10.2	11.3	13.7	11.7	11.9	19.8
Apr '20	7.7	10.8	11.3	15.5	13.9	15.7	12.3	15.6
Mar '20	20.3	19.2	24.7	27.7	21.9	20.4	26.4	25.8
Feb '20	16.9	17.7	27.1	30.9	21.4	24.3	26.5	28
Jan '20	30.5	27.4	21.5	29.2	26.2	26.7	34.4	34