ID: 7720

AQSQID: 840250170010

Site Name: Chelmsfordnr

Added: April 21, 2020, 6:24 p.m.

Updated: Sept. 19, 2020, 4:39 p.m.

Location: Chelmsford (E Chelmsford), MA

Reporting: True, Located: True

Current AQI: 18.0

Chelmsford (E Chelmsford) MA, US: 42.612113, -71.307519

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
Sept. 19, 2020, 2 p.m. 4.0 ppb (4) 3.0 ppb (3) N/A 2.0 ppb (2) N/A N/A 24.0 ppb (18) N/A N/A 3.0 μg/m3 (12) 18.0
 
Sept. 19, 2020, 1 p.m. 5.0 ppb (5) 3.0 ppb (3) N/A 2.0 ppb (2) N/A N/A 21.0 ppb (16) N/A N/A 2.0 μg/m3 (8) 16.0
 
Sept. 19, 2020, noon 5.0 ppb (5) 2.0 ppb (2) N/A 2.0 ppb (2) N/A N/A 19.0 ppb (15) N/A N/A 3.0 μg/m3 (12) 15.0
 
Sept. 19, 2020, 11 a.m. 5.0 ppb (5) 2.0 ppb (2) N/A 3.0 ppb (3) N/A N/A 18.0 ppb (14) N/A N/A 2.0 μg/m3 (8) 14.0
 
Sept. 19, 2020, 10 a.m. 6.0 ppb (6) 2.0 ppb (2) N/A 4.0 ppb (4) N/A N/A 16.0 ppb (12) N/A N/A 3.0 μg/m3 (12) 12.0
 
Sept. 19, 2020, 9 a.m. 7.0 ppb (6) 2.0 ppb (2) N/A 4.0 ppb (4) N/A N/A 17.0 ppb (13) N/A N/A 7.0 μg/m3 (29) 29.0
 
Sept. 19, 2020, 8 a.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
Sept. 19, 2020, 7 a.m. N/A N/A N/A N/A N/A N/A 21.0 ppb (16) N/A N/A 5.0 μg/m3 (21) 21.0
 
Sept. 19, 2020, 6 a.m. N/A N/A N/A N/A N/A N/A 23.0 ppb (18) N/A N/A 6.0 μg/m3 (25) 25.0
 
Sept. 19, 2020, 5 a.m. N/A N/A N/A N/A N/A N/A 23.0 ppb (18) N/A N/A 8.0 μg/m3 (33) 33.0
 
Sept. 19, 2020, 4 a.m. 4.0 ppb (4) 2.0 ppb (2) N/A 2.0 ppb (2) N/A N/A 23.0 ppb (18) N/A N/A 9.0 μg/m3 (38) 38.0
 
Sept. 19, 2020, 3 a.m. 4.0 ppb (4) 2.0 ppb (2) N/A 2.0 ppb (2) N/A N/A 24.0 ppb (18) N/A N/A 7.0 μg/m3 (29) 29.0
 
Sept. 19, 2020, 2 a.m. 5.0 ppb (5) 2.0 ppb (2) N/A 3.0 ppb (3) N/A N/A 25.0 ppb (19) N/A N/A 4.0 μg/m3 (17) 19.0
 
Sept. 19, 2020, 1 a.m. 5.0 ppb (5) 2.0 ppb (2) N/A 3.0 ppb (3) N/A N/A 25.0 ppb (19) N/A N/A 4.0 μg/m3 (17) 19.0
 
Sept. 19, 2020, midnight 5.0 ppb (5) 2.0 ppb (2) N/A 3.0 ppb (3) N/A N/A 26.0 ppb (20) N/A N/A 5.0 μg/m3 (21) 21.0
 
Sept. 18, 2020, 11 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 4.0 ppb (4) N/A N/A 27.0 ppb (21) N/A N/A 6.0 μg/m3 (25) 25.0
 
Sept. 18, 2020, 10 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 25.0 ppb (19) N/A N/A 5.0 μg/m3 (21) 21.0
 
Sept. 18, 2020, 9 p.m. 4.0 ppb (4) 2.0 ppb (2) N/A 3.0 ppb (3) N/A N/A 24.0 ppb (18) N/A N/A 5.0 μg/m3 (21) 21.0
 
Sept. 18, 2020, 8 p.m. 6.0 ppb (6) 3.0 ppb (3) N/A 3.0 ppb (3) N/A N/A 24.0 ppb (18) N/A N/A 5.0 μg/m3 (21) 21.0
 
Sept. 18, 2020, 7 p.m. 5.0 ppb (5) 3.0 ppb (3) N/A 3.0 ppb (3) N/A N/A 24.0 ppb (18) N/A N/A 6.0 μg/m3 (25) 25.0
 
Sept. 18, 2020, 6 p.m. 6.0 ppb (6) 3.0 ppb (3) N/A 3.0 ppb (3) N/A N/A 26.0 ppb (20) N/A N/A 3.0 μg/m3 (12) 20.0
 
Sept. 18, 2020, 5 p.m. 8.0 ppb (7) 4.0 ppb (4) N/A 4.0 ppb (4) N/A N/A 25.0 ppb (19) N/A N/A 4.0 μg/m3 (17) 19.0
 
Sept. 18, 2020, 4 p.m. 5.0 ppb (5) 2.0 ppb (2) N/A 2.0 ppb (2) N/A N/A 26.0 ppb (20) N/A N/A 4.0 μg/m3 (17) 20.0
 
Sept. 18, 2020, 3 p.m. 8.0 ppb (7) 4.0 ppb (4) N/A 4.0 ppb (4) N/A N/A 23.0 ppb (18) N/A N/A 3.0 μg/m3 (12) 18.0
 
Sept. 18, 2020, 2 p.m. 8.0 ppb (7) 4.0 ppb (4) N/A 4.0 ppb (4) N/A N/A 21.0 ppb (16) N/A N/A 6.0 μg/m3 (25) 25.0
 
Sept. 18, 2020, 1 p.m. 6.0 ppb (6) 3.0 ppb (3) N/A 3.0 ppb (3) N/A N/A 21.0 ppb (16) N/A N/A 7.0 μg/m3 (29) 29.0
 
Sept. 18, 2020, noon 5.0 ppb (5) 3.0 ppb (3) N/A 3.0 ppb (3) N/A N/A 21.0 ppb (16) N/A N/A 7.0 μg/m3 (29) 29.0
 
Sept. 18, 2020, 11 a.m. 7.0 ppb (6) 3.0 ppb (3) N/A 4.0 ppb (4) N/A N/A 18.0 ppb (14) N/A N/A 7.0 μg/m3 (29) 29.0
 
Sept. 18, 2020, 10 a.m. 7.0 ppb (6) 3.0 ppb (3) N/A 4.0 ppb (4) N/A N/A 18.0 ppb (14) N/A N/A 9.0 μg/m3 (38) 38.0
 
Sept. 18, 2020, 9 a.m. 5.0 ppb (5) 2.0 ppb (2) N/A 3.0 ppb (3) N/A N/A 19.0 ppb (15) N/A N/A 8.0 μg/m3 (33) 33.0
 
Sept. 18, 2020, 8 a.m. 3.0 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 20.0 ppb (15) N/A N/A 7.0 μg/m3 (29) 29.0
 
Sept. 18, 2020, 7 a.m. 3.0 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 21.0 ppb (16) N/A N/A 7.0 μg/m3 (29) 29.0
 
Sept. 18, 2020, 6 a.m. 3.0 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 19.0 ppb (15) N/A N/A 9.0 μg/m3 (38) 38.0
 
Sept. 18, 2020, 5 a.m. 3.0 ppb (3) 0.0 ppb (0) N/A 2.0 ppb (2) N/A N/A 19.0 ppb (15) N/A N/A 7.0 μg/m3 (29) 29.0
 
Sept. 18, 2020, 4 a.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 18.0 ppb (14) N/A N/A 6.0 μg/m3 (25) 25.0
 
Sept. 18, 2020, 3 a.m. 5.0 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A N/A 21.0 ppb (16) N/A N/A 8.0 μg/m3 (33) 33.0
 
Sept. 18, 2020, 2 a.m. 5.0 ppb (5) 0.0 ppb (0) N/A 4.0 ppb (4) N/A N/A 23.0 ppb (18) N/A N/A 9.0 μg/m3 (38) 38.0
 
Sept. 18, 2020, 1 a.m. 5.0 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A N/A 24.0 ppb (18) N/A N/A 6.0 μg/m3 (25) 25.0
 
Sept. 18, 2020, midnight 6.0 ppb (6) 1.0 ppb (1) N/A 5.0 ppb (5) N/A N/A 25.0 ppb (19) N/A N/A 6.0 μg/m3 (25) 25.0
 
Sept. 17, 2020, 11 p.m. 8.0 ppb (7) 2.0 ppb (2) N/A 7.0 ppb (6) N/A N/A 29.0 ppb (22) N/A N/A 6.0 μg/m3 (25) 25.0
 
Sept. 17, 2020, 10 p.m. 25.0 ppb (23) 7.0 ppb (6) N/A 18.0 ppb (17) N/A N/A 25.0 ppb (19) N/A N/A 8.0 μg/m3 (33) 33.0
 
Sept. 17, 2020, 9 p.m. 33.0 ppb (31) 10.0 ppb (9) N/A 23.0 ppb (21) N/A N/A 25.0 ppb (19) N/A N/A 9.0 μg/m3 (38) 38.0
 
Sept. 17, 2020, 8 p.m. 31.0 ppb (29) 10.0 ppb (9) N/A 21.0 ppb (19) N/A N/A 30.0 ppb (23) N/A N/A 8.0 μg/m3 (33) 33.0
 
Sept. 17, 2020, 7 p.m. 30.0 ppb (28) 11.0 ppb (10) N/A 20.0 ppb (19) N/A N/A 33.0 ppb (25) N/A N/A 7.0 μg/m3 (29) 29.0
 
Sept. 17, 2020, 6 p.m. 27.0 ppb (25) 9.0 ppb (8) N/A 18.0 ppb (17) N/A N/A 35.0 ppb (27) N/A N/A 10.0 μg/m3 (42) 42.0
 
Sept. 17, 2020, 5 p.m. 28.0 ppb (26) 12.0 ppb (11) N/A 16.0 ppb (15) N/A N/A 34.0 ppb (26) N/A N/A 6.0 μg/m3 (25) 26.0
 
Sept. 17, 2020, 4 p.m. 18.0 ppb (17) 6.0 ppb (6) N/A 12.0 ppb (11) N/A N/A 35.0 ppb (27) N/A N/A 7.0 μg/m3 (29) 29.0
 
Sept. 17, 2020, 3 p.m. 32.0 ppb (30) 15.0 ppb (14) N/A 17.0 ppb (16) N/A N/A 27.0 ppb (21) N/A N/A 6.0 μg/m3 (25) 30.0
 
Sept. 17, 2020, 2 p.m. 36.0 ppb (33) 19.0 ppb (18) N/A 17.0 ppb (16) N/A N/A 20.0 ppb (15) N/A N/A 6.0 μg/m3 (25) 33.0
 
Sept. 17, 2020, 1 p.m. 39.0 ppb (36) 23.0 ppb (21) N/A 16.0 ppb (15) N/A N/A 14.0 ppb (11) N/A N/A 5.0 μg/m3 (21) 36.0
 
Sept. 17, 2020, noon 50.0 ppb (46) 32.0 ppb (30) N/A 18.0 ppb (17) N/A N/A 9.0 ppb (7) N/A N/A 5.0 μg/m3 (21) 46.0
 
Sept. 17, 2020, 11 a.m. 48.0 ppb (44) 30.0 ppb (28) N/A 18.0 ppb (17) N/A N/A 5.0 ppb (4) N/A N/A 2.0 μg/m3 (8) 44.0
 
Sept. 17, 2020, 10 a.m. 33.0 ppb (31) 18.0 ppb (17) N/A 15.0 ppb (14) N/A N/A 6.0 ppb (5) N/A N/A 1.0 μg/m3 (4) 31.0
 
Sept. 17, 2020, 9 a.m. 19.0 ppb (18) 8.0 ppb (7) N/A 12.0 ppb (11) N/A N/A 11.0 ppb (8) N/A N/A 2.0 μg/m3 (8) 18.0
 
Sept. 17, 2020, 8 a.m. 34.0 ppb (31) 19.0 ppb (18) N/A 15.0 ppb (14) N/A N/A 7.0 ppb (5) N/A N/A 5.0 μg/m3 (21) 31.0
 
Sept. 17, 2020, 7 a.m. 35.0 ppb (32) 20.0 ppb (19) N/A 15.0 ppb (14) N/A N/A 6.0 ppb (5) N/A N/A 5.0 μg/m3 (21) 32.0
 
Sept. 17, 2020, 6 a.m. 30.0 ppb (28) 16.0 ppb (15) N/A 14.0 ppb (13) N/A N/A 7.0 ppb (5) N/A N/A 4.0 μg/m3 (17) 28.0
 
Sept. 17, 2020, 5 a.m. 29.0 ppb (27) 14.0 ppb (13) N/A 15.0 ppb (14) N/A N/A 9.0 ppb (7) N/A N/A 3.0 μg/m3 (12) 27.0
 
Sept. 17, 2020, 4 a.m. 30.0 ppb (28) 12.0 ppb (11) N/A 18.0 ppb (17) N/A N/A 10.0 ppb (8) N/A N/A 4.0 μg/m3 (17) 28.0
 
Sept. 17, 2020, 3 a.m. 19.0 ppb (18) 6.0 ppb (6) N/A 13.0 ppb (12) N/A N/A 15.0 ppb (12) N/A N/A 3.0 μg/m3 (12) 18.0
 
Sept. 17, 2020, 2 a.m. 21.0 ppb (19) 8.0 ppb (7) N/A 13.0 ppb (12) N/A N/A 18.0 ppb (14) N/A N/A 4.0 μg/m3 (17) 19.0
 
Sept. 17, 2020, 1 a.m. 14.0 ppb (13) 5.0 ppb (5) N/A 9.0 ppb (8) N/A N/A 24.0 ppb (18) N/A N/A 4.0 μg/m3 (17) 18.0
 
Sept. 17, 2020, midnight 18.0 ppb (17) 7.0 ppb (6) N/A 11.0 ppb (10) N/A N/A 22.0 ppb (17) N/A N/A 4.0 μg/m3 (17) 17.0
 
Sept. 16, 2020, 11 p.m. 23.0 ppb (21) 9.0 ppb (8) N/A 13.0 ppb (12) N/A N/A 23.0 ppb (18) N/A N/A 4.0 μg/m3 (17) 21.0
 
Sept. 16, 2020, 10 p.m. 26.0 ppb (24) 10.0 ppb (9) N/A 16.0 ppb (15) N/A N/A 25.0 ppb (19) N/A N/A 5.0 μg/m3 (21) 24.0
 
Sept. 16, 2020, 9 p.m. 29.0 ppb (27) 13.0 ppb (12) N/A 16.0 ppb (15) N/A N/A 25.0 ppb (19) N/A N/A 4.0 μg/m3 (17) 27.0
 
Sept. 16, 2020, 8 p.m. 28.0 ppb (26) 13.0 ppb (12) N/A 15.0 ppb (14) N/A N/A 25.0 ppb (19) N/A N/A 6.0 μg/m3 (25) 26.0
 
Sept. 16, 2020, 7 p.m. 26.0 ppb (24) 12.0 ppb (11) N/A 14.0 ppb (13) N/A N/A 26.0 ppb (20) N/A N/A 9.0 μg/m3 (38) 38.0
 
Sept. 16, 2020, 6 p.m. 35.0 ppb (32) 18.0 ppb (17) N/A 16.0 ppb (15) N/A N/A 24.0 ppb (18) N/A N/A 6.0 μg/m3 (25) 32.0
 
Sept. 16, 2020, 5 p.m. 34.0 ppb (31) 17.0 ppb (16) N/A 16.0 ppb (15) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 31.0
 
Sept. 16, 2020, 4 p.m. 28.0 ppb (26) 15.0 ppb (14) N/A 13.0 ppb (12) N/A N/A N/A N/A N/A N/A 26.0
 
Sept. 16, 2020, 3 p.m. 36.0 ppb (33) 21.0 ppb (19) N/A 16.0 ppb (15) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 33.0
 
Sept. 16, 2020, 2 p.m. 43.0 ppb (40) 26.0 ppb (24) N/A 17.0 ppb (16) N/A N/A N/A N/A N/A 2.0 μg/m3 (8) 40.0
 
Sept. 16, 2020, 1 p.m. 45.0 ppb (42) 29.0 ppb (27) N/A 15.0 ppb (14) N/A N/A 12.0 ppb (9) N/A N/A 4.0 μg/m3 (17) 42.0
 
Sept. 16, 2020, noon 42.0 ppb (39) 26.0 ppb (24) N/A 15.0 ppb (14) N/A N/A 8.0 ppb (6) N/A N/A 5.0 μg/m3 (21) 39.0
 
Sept. 16, 2020, 11 a.m. 50.0 ppb (46) 34.0 ppb (31) N/A 16.0 ppb (15) N/A N/A 4.0 ppb (3) N/A N/A 4.0 μg/m3 (17) 46.0
 
Sept. 16, 2020, 10 a.m. 38.0 ppb (35) 24.0 ppb (22) N/A 14.0 ppb (13) N/A N/A 2.0 ppb (2) N/A N/A 5.0 μg/m3 (21) 35.0
 
Sept. 16, 2020, 9 a.m. 46.0 ppb (43) 31.0 ppb (29) N/A 15.0 ppb (14) N/A N/A 3.0 ppb (2) N/A N/A 7.0 μg/m3 (29) 43.0
 
Sept. 16, 2020, 8 a.m. 45.0 ppb (42) 30.0 ppb (28) N/A 15.0 ppb (14) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 42.0
 
Sept. 16, 2020, 7 a.m. N/A N/A N/A N/A N/A N/A 2.0 ppb (2) N/A N/A 6.0 μg/m3 (25) 25.0
 
Sept. 16, 2020, 6 a.m. N/A N/A N/A N/A N/A N/A 2.0 ppb (2) N/A N/A 6.0 μg/m3 (25) 25.0
 
Sept. 16, 2020, 5 a.m. N/A N/A N/A N/A N/A N/A 2.0 ppb (2) N/A N/A 4.0 μg/m3 (17) 17.0
 
Sept. 16, 2020, 4 a.m. 62.0 ppb (59) 46.0 ppb (43) N/A 16.0 ppb (15) N/A N/A 2.0 ppb (2) N/A N/A 5.0 μg/m3 (21) 59.0
 
Sept. 16, 2020, 3 a.m. 51.0 ppb (47) 34.0 ppb (31) N/A 17.0 ppb (16) N/A N/A 2.0 ppb (2) N/A N/A 6.0 μg/m3 (25) 47.0
 
Sept. 16, 2020, 2 a.m. 49.0 ppb (45) 31.0 ppb (29) N/A 18.0 ppb (17) N/A N/A 2.0 ppb (2) N/A N/A 6.0 μg/m3 (25) 45.0
 
Sept. 16, 2020, 1 a.m. 39.0 ppb (36) 20.0 ppb (19) N/A 19.0 ppb (18) N/A N/A 2.0 ppb (2) N/A N/A 6.0 μg/m3 (25) 36.0
 
Sept. 16, 2020, midnight 41.0 ppb (38) 21.0 ppb (19) N/A 20.0 ppb (19) N/A N/A 4.0 ppb (3) N/A N/A 6.0 μg/m3 (25) 38.0
 
Sept. 15, 2020, 11 p.m. 39.0 ppb (36) 19.0 ppb (18) N/A 20.0 ppb (19) N/A N/A 7.0 ppb (5) N/A N/A 9.0 μg/m3 (38) 38.0
 
Sept. 15, 2020, 10 p.m. 36.0 ppb (33) 18.0 ppb (17) N/A 19.0 ppb (18) N/A N/A 10.0 ppb (8) N/A N/A 3.0 μg/m3 (12) 33.0
 
Sept. 15, 2020, 9 p.m. 36.0 ppb (33) 19.0 ppb (18) N/A 18.0 ppb (17) N/A N/A 15.0 ppb (12) N/A N/A 5.0 μg/m3 (21) 33.0
 
Sept. 15, 2020, 8 p.m. 26.0 ppb (24) 13.0 ppb (12) N/A 12.0 ppb (11) N/A N/A 20.0 ppb (15) N/A N/A 3.0 μg/m3 (12) 24.0
 
Sept. 15, 2020, 7 p.m. 35.0 ppb (32) 21.0 ppb (19) N/A 15.0 ppb (14) N/A N/A 19.0 ppb (15) N/A N/A 4.0 μg/m3 (17) 32.0
 
Sept. 15, 2020, 6 p.m. 25.0 ppb (23) 15.0 ppb (14) N/A 11.0 ppb (10) N/A N/A 21.0 ppb (16) N/A N/A 4.0 μg/m3 (17) 23.0
 
Sept. 15, 2020, 5 p.m. 38.0 ppb (35) 24.0 ppb (22) N/A 14.0 ppb (13) N/A N/A 16.0 ppb (12) N/A N/A 1.0 μg/m3 (4) 35.0
 
Sept. 15, 2020, 4 p.m. 10.0 ppb (9) 5.0 ppb (5) N/A 5.0 ppb (5) N/A N/A 21.0 ppb (16) N/A N/A 1.0 μg/m3 (4) 16.0
 
Sept. 15, 2020, 3 p.m. 26.0 ppb (24) 17.0 ppb (16) N/A 9.0 ppb (8) N/A N/A 17.0 ppb (13) N/A N/A 0.0 μg/m3 (0) 24.0
 
Sept. 15, 2020, 2 p.m. 20.0 ppb (19) 12.0 ppb (11) N/A 7.0 ppb (6) N/A N/A 18.0 ppb (14) N/A N/A -2.0 μg/m3 (0) 19.0
 
Sept. 15, 2020, 1 p.m. 10.0 ppb (9) 5.0 ppb (5) N/A 6.0 ppb (6) N/A N/A 15.0 ppb (12) N/A N/A 3.0 μg/m3 (12) 12.0
 
Sept. 15, 2020, noon 10.0 ppb (9) 3.0 ppb (3) N/A 7.0 ppb (6) N/A N/A 10.0 ppb (8) N/A N/A 6.0 μg/m3 (25) 25.0
 
Sept. 15, 2020, 11 a.m. 25.0 ppb (23) 11.0 ppb (10) N/A 13.0 ppb (12) N/A N/A 4.0 ppb (3) N/A N/A 6.0 μg/m3 (25) 25.0
 
Sept. 15, 2020, 10 a.m. 29.0 ppb (27) 13.0 ppb (12) N/A 16.0 ppb (15) N/A N/A 2.0 ppb (2) N/A N/A 5.0 μg/m3 (21) 27.0
 
Sept. 15, 2020, 9 a.m. 42.0 ppb (39) 26.0 ppb (24) N/A 16.0 ppb (15) N/A N/A 4.0 ppb (3) N/A N/A 8.0 μg/m3 (33) 39.0
 
Sept. 15, 2020, 8 a.m. 32.0 ppb (30) 18.0 ppb (17) N/A 14.0 ppb (13) N/A N/A 7.0 ppb (5) N/A N/A 6.0 μg/m3 (25) 30.0
 
Sept. 15, 2020, 7 a.m. 5.0 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A N/A 18.0 ppb (14) N/A N/A 5.0 μg/m3 (21) 21.0
 
Sept. 15, 2020, 6 a.m. 7.0 ppb (6) 2.0 ppb (2) N/A 5.0 ppb (5) N/A N/A 19.0 ppb (15) N/A N/A 4.0 μg/m3 (17) 17.0
 
Sept. 15, 2020, 5 a.m. 6.0 ppb (6) 2.0 ppb (2) N/A 4.0 ppb (4) N/A N/A 23.0 ppb (18) N/A N/A 4.0 μg/m3 (17) 18.0
 
Sept. 15, 2020, 4 a.m. 7.0 ppb (6) 2.0 ppb (2) N/A 5.0 ppb (5) N/A N/A 23.0 ppb (18) N/A N/A 5.0 μg/m3 (21) 21.0
 
Sept. 15, 2020, 3 a.m. 7.0 ppb (6) 2.0 ppb (2) N/A 4.0 ppb (4) N/A N/A 24.0 ppb (18) N/A N/A 6.0 μg/m3 (25) 25.0
 
Sept. 15, 2020, 2 a.m. 8.0 ppb (7) 3.0 ppb (3) N/A 5.0 ppb (5) N/A N/A 24.0 ppb (18) N/A N/A 6.0 μg/m3 (25) 25.0
 
Sept. 15, 2020, 1 a.m. 7.0 ppb (6) 4.0 ppb (4) N/A 3.0 ppb (3) N/A N/A 25.0 ppb (19) N/A N/A 6.0 μg/m3 (25) 25.0
 
Sept. 15, 2020, midnight 8.0 ppb (7) 4.0 ppb (4) N/A 4.0 ppb (4) N/A N/A 25.0 ppb (19) N/A N/A 4.0 μg/m3 (17) 19.0
 
Sept. 14, 2020, 11 p.m. 7.0 ppb (6) 3.0 ppb (3) N/A 4.0 ppb (4) N/A N/A 25.0 ppb (19) N/A N/A 3.0 μg/m3 (12) 19.0
 
Sept. 14, 2020, 10 p.m. 6.0 ppb (6) 3.0 ppb (3) N/A 3.0 ppb (3) N/A N/A 26.0 ppb (20) N/A N/A 3.0 μg/m3 (12) 20.0
 
Sept. 14, 2020, 9 p.m. 7.0 ppb (6) 3.0 ppb (3) N/A 4.0 ppb (4) N/A N/A 25.0 ppb (19) N/A N/A 1.0 μg/m3 (4) 19.0
 
Sept. 14, 2020, 8 p.m. 8.0 ppb (7) 4.0 ppb (4) N/A 4.0 ppb (4) N/A N/A 25.0 ppb (19) N/A N/A 1.0 μg/m3 (4) 19.0
 
Sept. 14, 2020, 7 p.m. 12.0 ppb (11) 6.0 ppb (6) N/A 6.0 ppb (6) N/A N/A 25.0 ppb (19) N/A N/A 2.0 μg/m3 (8) 19.0
 
Sept. 14, 2020, 6 p.m. 15.0 ppb (14) 8.0 ppb (7) N/A 7.0 ppb (6) N/A N/A 25.0 ppb (19) N/A N/A 1.0 μg/m3 (4) 19.0
 
Sept. 14, 2020, 5 p.m. 13.0 ppb (12) 7.0 ppb (6) N/A 6.0 ppb (6) N/A N/A 25.0 ppb (19) N/A N/A 2.0 μg/m3 (8) 19.0
 
Sept. 14, 2020, 4 p.m. 8.0 ppb (7) 4.0 ppb (4) N/A 4.0 ppb (4) N/A N/A 25.0 ppb (19) N/A N/A 3.0 μg/m3 (12) 19.0
 
Sept. 14, 2020, 3 p.m. 12.0 ppb (11) 7.0 ppb (6) N/A 5.0 ppb (5) N/A N/A 24.0 ppb (18) N/A N/A 4.0 μg/m3 (17) 18.0
 
Sept. 14, 2020, 2 p.m. 11.0 ppb (10) 6.0 ppb (6) N/A 5.0 ppb (5) N/A N/A 23.0 ppb (18) N/A N/A 6.0 μg/m3 (25) 25.0
 
Sept. 14, 2020, 1 p.m. 15.0 ppb (14) 8.0 ppb (7) N/A 7.0 ppb (6) N/A N/A 20.0 ppb (15) N/A N/A 5.0 μg/m3 (21) 21.0
 
Sept. 14, 2020, noon 16.0 ppb (15) 8.0 ppb (7) N/A 8.0 ppb (7) N/A N/A 14.0 ppb (11) N/A N/A 3.0 μg/m3 (12) 15.0
 
Sept. 14, 2020, 11 a.m. 12.0 ppb (11) 4.0 ppb (4) N/A 7.0 ppb (6) N/A N/A 14.0 ppb (11) N/A N/A 3.0 μg/m3 (12) 12.0
 
Sept. 14, 2020, 10 a.m. 12.0 ppb (11) 3.0 ppb (3) N/A 8.0 ppb (7) N/A N/A 9.0 ppb (7) N/A N/A 3.0 μg/m3 (12) 12.0
 
Sept. 14, 2020, 9 a.m. 7.0 ppb (6) 2.0 ppb (2) N/A 5.0 ppb (5) N/A N/A 8.0 ppb (6) N/A N/A 6.0 μg/m3 (25) 25.0
 
Sept. 14, 2020, 8 a.m. 15.0 ppb (14) 5.0 ppb (5) N/A 10.0 ppb (9) N/A N/A 6.0 ppb (5) N/A N/A 3.0 μg/m3 (12) 14.0
 
Sept. 14, 2020, 7 a.m. 13.0 ppb (12) 6.0 ppb (6) N/A 7.0 ppb (6) N/A N/A 9.0 ppb (7) N/A N/A -1.0 μg/m3 (0) 12.0
 
Sept. 14, 2020, 6 a.m. 14.0 ppb (13) 6.0 ppb (6) N/A 8.0 ppb (7) N/A N/A 13.0 ppb (10) N/A N/A -2.0 μg/m3 (0) 13.0
 
Sept. 14, 2020, 5 a.m. 15.0 ppb (14) 7.0 ppb (6) N/A 8.0 ppb (7) N/A N/A 15.0 ppb (12) N/A N/A 5.0 μg/m3 (21) 21.0
 
Sept. 14, 2020, 4 a.m. 16.0 ppb (15) 7.0 ppb (6) N/A 9.0 ppb (8) N/A N/A 16.0 ppb (12) N/A N/A 6.0 μg/m3 (25) 25.0
 
Sept. 14, 2020, 3 a.m. 9.0 ppb (8) 3.0 ppb (3) N/A 6.0 ppb (6) N/A N/A 21.0 ppb (16) N/A N/A 3.0 μg/m3 (12) 16.0
 
Sept. 14, 2020, 2 a.m. 12.0 ppb (11) 5.0 ppb (5) N/A 7.0 ppb (6) N/A N/A 22.0 ppb (17) N/A N/A 3.0 μg/m3 (12) 17.0
 
Sept. 14, 2020, 1 a.m. 18.0 ppb (17) 6.0 ppb (6) N/A 11.0 ppb (10) N/A N/A 18.0 ppb (14) N/A N/A 6.0 μg/m3 (25) 25.0
 
Sept. 14, 2020, midnight 20.0 ppb (19) 7.0 ppb (6) N/A 12.0 ppb (11) N/A N/A 19.0 ppb (15) N/A N/A 6.0 μg/m3 (25) 25.0
 
Sept. 13, 2020, 11 p.m. 20.0 ppb (19) 7.0 ppb (6) N/A 13.0 ppb (12) N/A N/A 21.0 ppb (16) N/A N/A 4.0 μg/m3 (17) 19.0
 
Sept. 13, 2020, 10 p.m. 21.0 ppb (19) 8.0 ppb (7) N/A 13.0 ppb (12) N/A N/A 22.0 ppb (17) N/A N/A 3.0 μg/m3 (12) 19.0
 
Sept. 13, 2020, 9 p.m. 15.0 ppb (14) 6.0 ppb (6) N/A 9.0 ppb (8) N/A N/A 25.0 ppb (19) N/A N/A 5.0 μg/m3 (21) 21.0
 
Sept. 13, 2020, 8 p.m. 12.0 ppb (11) 5.0 ppb (5) N/A 7.0 ppb (6) N/A N/A 29.0 ppb (22) N/A N/A 7.0 μg/m3 (29) 29.0
 
Sept. 13, 2020, 7 p.m. 14.0 ppb (13) 7.0 ppb (6) N/A 7.0 ppb (6) N/A N/A 31.0 ppb (24) N/A N/A 9.0 μg/m3 (38) 38.0
 
Sept. 13, 2020, 6 p.m. 10.0 ppb (9) 5.0 ppb (5) N/A 5.0 ppb (5) N/A N/A 29.0 ppb (22) N/A N/A 7.0 μg/m3 (29) 29.0
 
Sept. 13, 2020, 5 p.m. 11.0 ppb (10) 5.0 ppb (5) N/A 6.0 ppb (6) N/A N/A 27.0 ppb (21) N/A N/A 5.0 μg/m3 (21) 21.0
 
Sept. 13, 2020, 4 p.m. 9.0 ppb (8) 5.0 ppb (5) N/A 4.0 ppb (4) N/A N/A 26.0 ppb (20) N/A N/A 7.0 μg/m3 (29) 29.0
 
Sept. 13, 2020, 3 p.m. 10.0 ppb (9) 5.0 ppb (5) N/A 5.0 ppb (5) N/A N/A 23.0 ppb (18) N/A N/A 7.0 μg/m3 (29) 29.0
 
Sept. 13, 2020, 2 p.m. 11.0 ppb (10) 6.0 ppb (6) N/A 5.0 ppb (5) N/A N/A 22.0 ppb (17) N/A N/A 7.0 μg/m3 (29) 29.0
 
Sept. 13, 2020, 1 p.m. 9.0 ppb (8) 5.0 ppb (5) N/A 4.0 ppb (4) N/A N/A 19.0 ppb (15) N/A N/A 7.0 μg/m3 (29) 29.0
 
Sept. 13, 2020, noon 16.0 ppb (15) 10.0 ppb (9) N/A 6.0 ppb (6) N/A N/A 8.0 ppb (6) N/A N/A 10.0 μg/m3 (42) 42.0
 
Sept. 13, 2020, 11 a.m. 16.0 ppb (15) 11.0 ppb (10) N/A 5.0 ppb (5) N/A N/A 2.0 ppb (2) N/A N/A 10.0 μg/m3 (42) 42.0
 
Sept. 13, 2020, 10 a.m. 10.0 ppb (9) 5.0 ppb (5) N/A 5.0 ppb (5) N/A N/A 2.0 ppb (2) N/A N/A 11.0 μg/m3 (46) 46.0
 
Sept. 13, 2020, 9 a.m. 15.0 ppb (14) 11.0 ppb (10) N/A 4.0 ppb (4) N/A N/A 2.0 ppb (2) N/A N/A 17.0 μg/m3 (61) 61.0
 
Sept. 13, 2020, 8 a.m. 19.0 ppb (18) 15.0 ppb (14) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
Sept. 13, 2020, 7 a.m. N/A N/A N/A N/A N/A N/A 2.0 ppb (2) N/A N/A 16.0 μg/m3 (59) 59.0
 
Sept. 13, 2020, 6 a.m. N/A N/A N/A N/A N/A N/A 2.0 ppb (2) N/A N/A 23.0 μg/m3 (73) 73.0
 
Sept. 13, 2020, 5 a.m. N/A N/A N/A N/A N/A N/A 2.0 ppb (2) N/A N/A 15.0 μg/m3 (56) 56.0
 
Sept. 13, 2020, 4 a.m. 32.0 ppb (30) 23.0 ppb (21) N/A 9.0 ppb (8) N/A N/A 2.0 ppb (2) N/A N/A 27.0 μg/m3 (82) 82.0
 
Sept. 13, 2020, 3 a.m. 22.0 ppb (20) 10.0 ppb (9) N/A 12.0 ppb (11) N/A N/A 2.0 ppb (2) N/A N/A 21.0 μg/m3 (69) 69.0
 
Sept. 13, 2020, 2 a.m. 18.0 ppb (17) 6.0 ppb (6) N/A 12.0 ppb (11) N/A N/A 4.0 ppb (3) N/A N/A 16.0 μg/m3 (59) 59.0
 
Sept. 13, 2020, 1 a.m. 19.0 ppb (18) 6.0 ppb (6) N/A 13.0 ppb (12) N/A N/A 6.0 ppb (5) N/A N/A 15.0 μg/m3 (56) 56.0
 
Sept. 13, 2020, midnight 22.0 ppb (20) 9.0 ppb (8) N/A 13.0 ppb (12) N/A N/A 8.0 ppb (6) N/A N/A 14.0 μg/m3 (54) 54.0
 
Sept. 12, 2020, 11 p.m. 20.0 ppb (19) 8.0 ppb (7) N/A 12.0 ppb (11) N/A N/A 11.0 ppb (8) N/A N/A 13.0 μg/m3 (52) 52.0
 
Sept. 12, 2020, 10 p.m. 15.0 ppb (14) 6.0 ppb (6) N/A 8.0 ppb (7) N/A N/A 16.0 ppb (12) N/A N/A 6.0 μg/m3 (25) 25.0
 
Sept. 12, 2020, 9 p.m. 13.0 ppb (12) 6.0 ppb (6) N/A 7.0 ppb (6) N/A N/A 21.0 ppb (16) N/A N/A 6.0 μg/m3 (25) 25.0
 
Sept. 12, 2020, 8 p.m. 14.0 ppb (13) 7.0 ppb (6) N/A 7.0 ppb (6) N/A N/A 23.0 ppb (18) N/A N/A 3.0 μg/m3 (12) 18.0
 
Sept. 12, 2020, 7 p.m. 12.0 ppb (11) 6.0 ppb (6) N/A 5.0 ppb (5) N/A N/A 24.0 ppb (18) N/A N/A 4.0 μg/m3 (17) 18.0
 
Sept. 12, 2020, 6 p.m. 11.0 ppb (10) 6.0 ppb (6) N/A 5.0 ppb (5) N/A N/A 23.0 ppb (18) N/A N/A 3.0 μg/m3 (12) 18.0
 
Sept. 12, 2020, 5 p.m. 8.0 ppb (7) 4.0 ppb (4) N/A 4.0 ppb (4) N/A N/A 21.0 ppb (16) N/A N/A 4.0 μg/m3 (17) 17.0
 
Sept. 12, 2020, 4 p.m. 12.0 ppb (11) 6.0 ppb (6) N/A 6.0 ppb (6) N/A N/A 20.0 ppb (15) N/A N/A 4.0 μg/m3 (17) 17.0
 
Sept. 12, 2020, 3 p.m. 10.0 ppb (9) 6.0 ppb (6) N/A 4.0 ppb (4) N/A N/A 20.0 ppb (15) N/A N/A 2.0 μg/m3 (8) 15.0